feat: introduce grouped version updates for dependabot (#617)

Author: mfranzke

.github/dependabot.yml

@@ -22,3 +22,7 @@ updates:
       separator: "-"
     # https://github.com/dependabot/dependabot-core/issues/5226#issuecomment-1179434437
     versioning-strategy: increase
+    groups:
+      commitlint:
+        patterns:
+          - "@commitlint*"