chore(renovate): config mariadb-operator and mariadb-operator-crds

We want these to be one PR and get bumped together and never separately
to avoid out of sync deployments.

Author: cardoe

.github/renovate.json

@@ -30,6 +30,14 @@
       "groupName": "Go",
       "commitMessageTopic": "Go"
     },
+    {
+      "matchPackageNames": [
+        "mariadb-operator",
+        "mariadb-operator-crds"
+      ],
+      "groupName": "MariaDB Operator",
+      "commitMessageTopic": "MariaDB Operator"
+    },
     {
       "enabled": false,
       "matchPackageNames": ["python"],