Deprecate old python in dependency scanning

data/deprecations/14-8-secure-ca-python-deprecation.yml

+- name: "Dependency Scanning Python 3.9 and 3.6 image deprecation" # The name of the feature to be deprecated
+  announcement_milestone: "14.8" # The milestone when this feature was first announced as deprecated.
+  announcement_date: "2021-02-22" # The date of the milestone release when this feature was first announced as deprecated. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
+  removal_milestone: "15.0" # The milestone when this feature is planned to be removed
+  removal_date: 2021-05-22 # The date of the milestone release when this feature was first announced as deprecated. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
+  breaking_change: true # If this deprecation is a breaking change, set this value to true
+  body: | # Do not modify this line, instead modify the lines below.
+    For those using Dependency Scanning for Python projects, we are deprecating the default `gemnasium-python:2` image which uses Python 3.6 as well as the custom `gemnasium-python:2-python-3.9` image which uses Python 3.9. The new default image as of GitLab 15.0 will be for Python 3.9 as it is a [supported version](https://endoflife.date/python) and 3.6 [is no longer supported](https://endoflife.date/python).
+
+    For users using Python 3.9 or 3.9-compatible projects, you should not need to take action and dependency scanning should begin to work in GitLab 15.0. If you wish to test the new container now please run a test pipeline in your project with this container (which will be removed in 15.0). Use the Python 3.9 image:
+
+    ```yaml
+    gemnasium-python-dependency_scanning:
+      image:
+        name: registry.gitlab.com/gitlab-org/security-products/analyzers/gemnasium-python:2-python-3.9
+    ```
+
+    For users using Python 3.6, as of GitLab 15.0 you will no longer be able to use the default template for dependency scanning. You will need to switch to use the deprecated `gemnasium-python:2` analyzer image. If you are impacted by this please comment in [this issue](https://gitlab.com/gitlab-org/gitlab/-/issues/351503) so we can extend the removal if needed.
+
+    For users using the 3.9 special exception image, you must instead use the default value and no longer override your container. To verify if you are using the 3.9 special exception image, check your `.gitlab-ci.yml` file for the following reference: 
+
+    ```yaml
+    gemnasium-python-dependency_scanning:
+      image:
+        name: registry.gitlab.com/gitlab-org/security-products/analyzers/gemnasium-python:2-python-3.9
+    ```
+# The following items are not published on the docs page, but may be used in the future.
+  stage: secure # (optional - may be required in the future) String value of the stage that the feature was created in. e.g., Growth
+  tiers: ultimate # (optional - may be required in the future) An array of tiers that the feature is available in currently.  e.g., [Free, Silver, Gold, Core, Premium, Ultimate]
+  issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/334060 # (optional) This is a link to the deprecation issue in GitLab
+  documentation_url: # (optional) This is a link to the current documentation page
+  image_url: # (optional) This is a link to a thumbnail image depicting the feature
+  video_url: # (optional) Use the youtube thumbnail URL with the structure of https://img.youtube.com/vi/UNIQUEID/hqdefault.jpg

doc/update/deprecations.md

@@ -748,6 +748,36 @@ For additional context, or to provide feedback regarding this change, please ref
 
 **Planned removal milestone: 15.0 (2022-05-22)**
 
+### Dependency Scanning Python 3.9 and 3.6 image deprecation
+
+WARNING:
+This feature will be changed or removed in 15.0
+as a [breaking change](https://docs.gitlab.com/ee/development/contributing/#breaking-changes).
+Before updating GitLab, review the details carefully to determine if you need to make any
+changes to your code, settings, or workflow.
+
+For those using Dependency Scanning for Python projects, we are deprecating the default `gemnasium-python:2` image which uses Python 3.6 as well as the custom `gemnasium-python:2-python-3.9` image which uses Python 3.9. The new default image as of GitLab 15.0 will be for Python 3.9 as it is a [supported version](https://endoflife.date/python) and 3.6 [is no longer supported](https://endoflife.date/python).
+
+For users using Python 3.9 or 3.9-compatible projects, you should not need to take action and dependency scanning should begin to work in GitLab 15.0. If you wish to test the new container now please run a test pipeline in your project with this container (which will be removed in 15.0). Use the Python 3.9 image:
+
+```yaml
+gemnasium-python-dependency_scanning:
+  image:
+    name: registry.gitlab.com/gitlab-org/security-products/analyzers/gemnasium-python:2-python-3.9
+```
+
+For users using Python 3.6, as of GitLab 15.0 you will no longer be able to use the default template for dependency scanning. You will need to switch to use the deprecated `gemnasium-python:2` analyzer image. If you are impacted by this please comment in [this issue](https://gitlab.com/gitlab-org/gitlab/-/issues/351503) so we can extend the removal if needed.
+
+For users using the 3.9 special exception image, you must instead use the default value and no longer override your container. To verify if you are using the 3.9 special exception image, check your `.gitlab-ci.yml` file for the following reference: 
+
+```yaml
+gemnasium-python-dependency_scanning:
+  image:
+    name: registry.gitlab.com/gitlab-org/security-products/analyzers/gemnasium-python:2-python-3.9
+```
+
+**Planned removal milestone: 15.0 (2021-05-22)**
+
 ### Deprecate Geo Admin UI Routes
 
 In GitLab 13.0, we introduced new project and design replication details routes in the Geo Admin UI. These routes are `/admin/geo/replication/projects` and `/admin/geo/replication/designs`. We kept the legacy routes and redirected them to the new routes. In GitLab 15.0, we will remove support for the legacy routes `/admin/geo/projects` and `/admin/geo/designs`. Please update any bookmarks or scripts that may use the legacy routes.