Revert "Restrict access to release branch: release-R125 to LTS Refresher group."

This reverts commit aa6126b7b3b7a95e4a98ae4ae5150cb78b065262.

Reason for revert: refresh done

Change-Id: Id8542b51a3eb321d3bb557e9e261933765033231
Reviewed-on: https://cos-review.googlesource.com/c/All-Projects/+/116321
Reviewed-by: Angel Adetula <angeladetula@google.com>
Tested-by: Robert Kolchmeyer <rkolchmeyer@google.com>