Set Dependabot grouped updates back to weekly cadence

Author: wallstop

.github/dependabot.yml

@@ -3,7 +3,7 @@ updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "monthly"
+      interval: "weekly"
     open-pull-requests-limit: 1
     groups:
       ci-dependencies: