chore: Included githubactions in the dependabot config (#5364)

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>

.github/dependabot.yml

@@ -12,3 +12,10 @@ updates:
       interval: "weekly"
     labels: ["dependencies"]
 
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule: 
+     interval: weekly
+    labels: 
+     - "dependencies"
+