chore: replace dependabot with renovate

Author: mdt-fastned

.github/dependabot.yml

@@ -0,0 +1,14 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    ":automergePatch",
+    "schedule:monthly",
+    "config:recommended",
+    "group:recommended"
+  ],
+  "rebaseWhen": "behind-base-branch",
+  "lockFileMaintenance": {
+    "enabled": true,
+    "automerge": true
+  }
+}