chore: Included githubactions in the dependabot config (#860)

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 <[email protected]>

Co-authored-by: peter scholz <[email protected]>

Author: naveensrinivasan

.github/dependabot.yml

@@ -12,3 +12,9 @@ updates:
       day: "friday"
     assignees:
       - "LeFnord"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule: 
+      interval: weekly
+    assignees: 
+     - "LeFnord"