Update dependabot config

Author: vjik

.github/dependabot.yml

@@ -1,20 +1,24 @@
 version: 2
 updates:
-  # Maintain dependencies for GitHub Actions.
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: "weekly"
     cooldown:
       default-days: 7
+    groups:
+      github-actions:
+        patterns: [ "*" ]
     ignore:
       - dependency-name: "yiisoft/*"
 
-  # Maintain dependencies for Composer
   - package-ecosystem: "composer"
     directory: "/"
     schedule:
       interval: "daily"
     cooldown:
       default-days: 7
-    versioning-strategy: increase-if-necessary
+    groups:
+      composer-dev-dependencies:
+        dependency-type: "development"
+    versioning-strategy: "widen"