Update Gitlab Runner to v15

chart/values.yaml

@@ -896,7 +896,7 @@ addons:
     git:
       repo: https://repo1.dso.mil/platform-one/big-bang/apps/developer-tools/gitlab-runner.git
       path: "./chart"
-      tag: "0.39.0-bb.3"
+      tag: "0.41.0-bb.0"
 
     # -- Flux reconciliation overrides specifically for the Gitlab Runner Package
     flux: {}