Bump Gitaly version to v1.12.0

Stan Hurequested to merge
sh-bump-gitaly-version-1.12.0 into master

See https://gitlab.com/gitlab-org/gitaly/blob/master/CHANGELOG.md.

This fixes two main issues:

  1. Incorrect tree entries retrieved with directories that have curly braces: https://gitlab.com/gitlab-org/gitlab-ce/issues/46261
  2. Wildcard protected branches not working with remote mirrors: gitaly#1435 (closed)

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