deps: update github/codeql-action action to v2.21.8 (#2889)

* deps: update github/codeql-action action to v2.21.8

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

.github/workflows/scorecard.yml

@@ -67,6 +67,6 @@ jobs:
 
       # Upload the results to GitHub's code scanning dashboard.
       - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@a09933a12a80f87b87005513f0abb1494c27a716 # v2.21.4
+        uses: github/codeql-action/upload-sarif@6a28655e3dcb49cb0840ea372fd6d17733edd8a4 # v2.21.8
         with:
           sarif_file: results.sarif