git: Pin cgit image to the deployed version.

The cluster runs docker.io/woahbase/alpine-cgit:x86_64_1.2.1_20210405,
not :latest.  Sync the manifest with the live Deployment.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Change-Id: Ia94cf7e3844b3186c1cb5d8781b34b711bf56cd7
1 file changed