Update src/compliance to point to main branches instead of release.

BUG=b/245375131
TEST=None
RELEASE_NOTE=None

Change-Id: I8935086c5c6725957152666251e638f643567e1c
Reviewed-on: https://cos-review.googlesource.com/c/cos/manifest/+/36868
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Tested-by: Arnav Kansal <rnv@google.com>

external_full.xml

diff --git a/external_full.xml b/external_full.xml
index 00dffe8..9edc4a9 100644
--- a/external_full.xml
+++ b/external_full.xml
@@ -94,7 +94,7 @@
            revision="refs/heads/release-R101" />
   <project path="src/compliance"
            name="cos/compliance"
-           revision="refs/heads/release-R101" />
+           revision="refs/heads/main-R101" />
   <project path="src/repohooks"
            name="cos/repohooks"
            revision="refs/heads/master" />