chore: Included githubactions in the dependabot config (#7932)

This should help with keeping the GitHub actions updated on new releases. This will also help with keeping it secure.

Dependabot helps in keeping the supply chain secure https://docs.github.com/en/code-security/dependabot

GitHub actions up to date https://docs.github.com/en/code-security/dependabot/working-with-dependabot/keeping-your-actions-up-to-date-with-dependabot

https://github.com/ossf/scorecard/blob/main/docs/checks.md#dependency-update-tool
Signed-off-by: naveensrinivasan <172697+naveensrinivasan@users.noreply.github.com>

Co-authored-by: repo-ranger[bot] <39074581+repo-ranger[bot]@users.noreply.github.com>

.github/dependabot.yml

@@ -36,3 +36,8 @@ updates:
       day: friday
       time: '12:00'
     open-pull-requests-limit: 99
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 99