chore(dependabot): use grouped updates

Author: saschanaz

.github/dependabot.yml

@@ -15,3 +15,7 @@ updates:
     # https://github.com/dependabot/dependabot-core/issues/3103
     # https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates#versioning-strategy
     versioning-strategy: "increase"
+    groups:
+      dev-dependencies:
+        patterns:
+          - "*"