Prevent renovate from updating to groovy 5+ (#15283)

Author: laurit

.github/renovate.json5

@@ -169,6 +169,16 @@
         'org.snakeyaml:snakeyaml-engine'
       ],
     },
+    {
+      // groovy 5+ requires Java 11+
+      matchUpdateTypes: [
+        'major',
+      ],
+      enabled: false,
+      matchPackageNames: [
+        'org.apache.groovy:**'
+      ],
+    },
     {
       // vaadin 14 tests require node 16
       matchPackageNames: [