Bumped Gitaly protocol to v13.10.3

Nothing of consequence to us:

- more comments
- removal of `name` field for Git remotes (mirrors-related)
4 jobs for !62 with topic/default/gitaly-13.10.3 in 2 minutes and 6 seconds (queued for 1 second)
latest merge request
Name Stage Failure
tests-hg-stable Compat
FAILED hgitaly/tests/test_manifest.py::test_iter_dir_with_flat_paths_integration
FAILED hgitaly/tests/test_messages.py::test_tag - TypeError: cannot convert d...
FAILED hgitaly/tests/test_revision.py::test_gitlab_revision_changeset_by_hex
FAILED hgitaly/tests/test_revision.py::test_gitlab_revision_special_ref - Typ...
FAILED hgitaly/tests/test_revision.py::test_gitlab_revision_gl_branch - TypeE...
FAILED hgitaly/tests/test_servicer.py::test_load_repo_gc - TypeError: cannot ...
============ 56 failed, 37 passed, 14 skipped, 1 warning in 59.95s =============
Cleaning up file based variables
ERROR: Job failed: exit code 1