Fix the dependabot ignore directive for github/codeql-action

This was erroneously configured with each of the sub-Actions in the
github/codeql-action repository. They are versioned as one under the
github/codeql-action namespace.

.github/dependabot.yml

@@ -22,9 +22,7 @@ updates:
       # # Managed by cisagov/skeleton-python-library
       # - dependency-name: actions/download-artifact
       # - dependency-name: actions/upload-artifact
-      # - dependency-name: github/codeql-action/analyze
-      # - dependency-name: github/codeql-action/autobuild
-      # - dependency-name: github/codeql-action/init
+      # - dependency-name: github/codeql-action
     package-ecosystem: github-actions
     schedule:
       interval: weekly