Switch back to released version of oauth2-proxy.
Switch back to released version of oauth2-proxy.

The change we wanted to test is part of the release, but unfortunately
did not fix the issue we were seeing.

Change-Id: I22c1dd4487327d143529aaa6e0e27a5a6402d5fe
GitOrigin-RevId: aef7b6c6d979d2974b69c44fd79cf95bdd256ba0

googlecloudrobotics/core,googlecloudrobotics/core,googlecloudrobotics/core