dependabot: Extend to also monitor workflow actions

Extend dependabot configuration to monitor workflow action versions

Signed-off-by: Anderson Toshiyuki Sasaki <[email protected]>

Author: ansasaki

.github/dependabot.yml

@@ -10,3 +10,7 @@ updates:
     schedule:
       interval: "daily"
     versioning-strategy: lockfile-only
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"