[ci skip] chore: update patch group name and disable netty updates (CloudNetService#1191)

### Motivation
Renovate tries to update netty to a `Final-SNAPSHOT` version instead of
staying on the `Alpha` cycle.

### Modification
Disabled netty updates completly.

### Result
No netty updates from renovate.

Author: 0utplay

.github/renovate.json

@@ -27,7 +27,7 @@
       "excludePackageNames": [
         "gradle"
       ],
-      "groupName": "patch dependency updates"
+      "groupName": "all dependencies with patch changes"
     },
     {
       "description": "Correct Guava version handling",
@@ -46,6 +46,13 @@
       ],
       "enabled": false
     },
+    {
+      "description": "Disabled until netty5 stable release",
+      "matchPackagePrefixes": [
+        "io.netty:"
+      ],
+      "enabled": false
+    },
     {
       "description": "Breaks old databases so we don't need updates",
       "matchPackagePrefixes": [