Update dependabot.yml

Author: MichaelHatherly

.github/dependabot.yml

@@ -1,6 +1,11 @@
 version: 2
 updates:
   - package-ecosystem: "github-actions"
+    groups:
+      # Group all GitHub Actions PRs into a single PR:
+      all-github-actions:
+        patterns:
+          - "*"
     directory: "/"
     schedule:
       interval: "monthly"