software/gitlab: update gitlab-ce to fix npm error

Since yesterday, software/gitlab can no longer be installed with an
error while installing gitlab_npm:

    ERR! Invalid dependency type requested: alias

This is because we are using npm install to install a repository which
uses yarn.lock to pin versions, so the install was done without having
the dependencies pinned. Using an old yarn for this repository does not
seem so easy, so we just have made a commit to convert the yarn.lock to
a package-lock.json, so that we don't have to update the tooling here.

Once we update, we'll rework this part of the software to use yarn, it
seems gitlab still uses yarn in more recent versions.

`git describe` also produced different (more correct) output, because
some tags were missing in our mirror of gitlab-ce.

software/gitlab/software.cfg

@@ -135,7 +135,7 @@ git-executable = ${git:location}/bin/git
 <= git-repository
 repository = https://lab.nexedi.com/nexedi/gitlab-ce.git
 # 9.5.10 + NXD patches:
-revision = v8.16.0.pre-16286-g9d66cd7b834
+revision = v9.5.10-12-g74c9f9fe7f9
 location = ${buildout:parts-directory}/gitlab
 
 [gitlab-shell-repository]