[CI] Try to run dependabot on local github actions install-premake5 too

Author: Jarod42

.github/dependabot.yml

@@ -4,7 +4,9 @@
 version: 2
 updates:
   - package-ecosystem: github-actions
-    directory: /
+    directories:
+      - /
+      - /.github/actions/install-premake5
     groups:
       github-actions:
         patterns: