gitlab: Use ingress class nginx as deployed.

The GitLab resource was applied with global.ingress.class: nginx and
without the deprecated kubernetes.io/ingress.class annotation; the
ingresses use ingressClassName: nginx.  Sync the manifest with that.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Change-Id: I7e31731c1909d0103c5cbf78b21f57692ae7b547
1 file changed