gbmcweb: switch to release branch https://gbmc-review.git.corp.google.com/c/meta-gbmc-staging/+/21675 Incorrectly set the release branch. Fixing it here Tested: compiles Fusion: https://fusion2.corp.google.com/7db38fe3-1c41-447b-bfb3-4b9a912a1464 Google-Bug-Id: 339863954 Change-Id: Ibb1e24216a9409b325d99f21da9b23b36bf56dff Signed-off-by: Edward Lee <edwarddl@google.com>