Add dependabot

Author: hugovk

.github/dependabot.yml

@@ -0,0 +1,25 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: monthly
+    groups:
+      actions:
+        patterns:
+          - "*"
+    cooldown:
+      default-days: 7
+
+  - package-ecosystem: pip
+    directory: "/"
+    schedule:
+      interval: monthly
+    assignees:
+      - "ezio-melotti"
+    groups:
+      pip:
+        patterns:
+          - "*"
+    cooldown:
+      default-days: 7

.pre-commit-config.yaml

@@ -23,6 +23,7 @@ repos:
   - repo: https://github.com/python-jsonschema/check-jsonschema
     rev: 0.36.0
     hooks:
+      - id: check-dependabot
       - id: check-github-workflows
 
   - repo: https://github.com/rhysd/actionlint