fix(ci): Fix github actions dependabot (#8985)

Our GitHub actions packages are not being updated. This may be a reason
why.

Edit: Looks like it's not applying to our composite actions in
.github/actions. Will see if this fixes it.

.github/dependabot.yml

@@ -10,11 +10,11 @@ updates:
     schedule:
       interval: monthly
   - package-ecosystem: pip
-    directory: /
+    directory: /.github
     schedule:
       interval: monthly
   - package-ecosystem: github-actions
-    directory: /
+    directory: /.github
     schedule:
       interval: monthly
   - package-ecosystem: cargo