Upgraded git-sync (Config Sync dependency for pulling from git) from v3.6.9 to v4.1.0 to pick up enhancements, such as improved efficiency and race condition fixes

## Breaking Upgraded git-sync (Config Sync dependency for pulling from git) from v3.6.9 to v4.1.0 to pick up enhancements, such as improved efficiency and race condition fixes. This contains a breaking change that short commit SHA is no longer accepted in the `spec.git.revision` field of RootSync and RepoSync. If you want to sync from a Git commit, use a full commit SHA in the `spec.git.revision` field. For more details, please refer to [Configuration for the Git repository](https://cloud.google.com/anthos-config-management/docs/reference/rootsync-reposync-fields#configuring-git-repo). This release note was updated February 16, 2024 with a correction to the version number.