Group CodeQL action Dependabot updates

Keep the CodeQL init, analyze, and upload actions on the same
revision by updating them in a single Dependabot pull request.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: d19fbf17-0afc-45a8-84e4-e9e52ac9f73e

Author: cklin

.github/dependabot.yml

@@ -41,6 +41,10 @@ updates:
       day: "thursday" # Thursday is arbitrary
     labels:
       - "Update dependencies"
+    groups:
+      codeql-action:
+        patterns:
+          - "github/codeql-action/*"
   - package-ecosystem: docker
     directory: "extensions/ql-vscode/test/e2e/docker"
     cooldown: