chore: group monthly dependabot updates for actions and pre-commit

Author: azmeuk

.github/dependabot.yml

@@ -0,0 +1,21 @@
+version: 2
+multi-ecosystem-groups:
+  dependencies:
+    schedule:
+      interval: monthly
+    commit-message:
+      prefix: chore
+      include: scope
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    patterns: ["*"]
+    multi-ecosystem-group: dependencies
+    cooldown:
+      default-days: 7
+  - package-ecosystem: pre-commit
+    directory: /
+    patterns: ["*"]
+    multi-ecosystem-group: dependencies
+    cooldown:
+      default-days: 7