Gitlab

Creating changelogs

• https://docs.gitlab.com/ee/user/project/changelogs.html
• https://docs.gitlab.com/ee/development/changelog.html

The Changelog trailer accepts the following values:

• added: New feature
• fixed: Bug fix
• changed: Feature change
• deprecated: New deprecation
• removed: Feature removal
• security: Security fix
• performance: Performance improvement
• other: Other

Update git vendor to gitlab

Now that we are using gitaly to compile git, the git version isn't known
from the manifest, instead we are getting the gitaly version. Update our
vendor field to be `gitlab` to avoid cve matching old versions.

Changelog: changed