Verified that we still have the enterprise plan (git sync support is listed), and I am listed as an admin. However, I cannot seem to find where to administrate the git sync functionality.
Noticed it was broken recently, so new changes to our prod branch are gonna have to be done manually
Generally speaking, we have deprecated support for the older Git Sync functionality in favor of true Source Control. There's a guide for migrating to this new system here. That said, you should still be able to configure the legacy syncing via your org's Advanced Settings.