fix(secrets): remove duplicate git-pull-secret from kustomization

github/git-pull-secret.yaml was sealed with redis namespace — same secret
as redis/github-pull-secret.yaml which was sealed from live cluster.
Keeping the correctly placed redis/ version.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

secrets/kustomization.yaml

@@ -7,7 +7,6 @@ resources:
   - kargo/kargo-admin-password-secret.yaml
   - github/git-kargo-secret.yaml
   - github/git-nowchess-secret.yaml
-  - github/git-pull-secret.yaml
   - nowchess/staging/ghcr-pull-secret.yaml
   - nowchess/staging/ncs-jwt-keys.yaml
   - nowchess/staging/ncs-db-secrets.yaml