Merge branch 'mermaid-update' into 'master'

Update mermaid to 8.4.2 to support more diagram/graph types

See merge request gitlab-org/gitlab!19444

changelogs/unreleased/mermaid-update.yml

+---
+title: Update to Mermaid v8.4.2 to support more graph types
+merge_request: 19444
+author:
+type: changed

config/dependency_decisions.yml

@@ -620,3 +620,9 @@
     :why: https://github.com/hexorx/countries/blob/master/LICENSE
     :versions: []
     :when: 2019-09-11 13:08:28.431132000 Z
+- - :whitelist
+  - "(MIT OR CC0-1.0)"
+  - :who: 
+    :why: 
+    :versions: []
+    :when: 2019-11-08 10:03:31.787226000 Z

package.json

@@ -99,7 +99,7 @@
     "jszip-utils": "^0.0.2",
     "katex": "^0.10.0",
     "marked": "^0.3.12",
-    "mermaid": "^8.2.6",
+    "mermaid": "^8.4.2",
     "monaco-editor": "^0.15.6",
     "monaco-editor-webpack-plugin": "^1.7.0",
     "mousetrap": "^1.4.6",