Limit Renovate snakeyaml updates to 2.x (#7855)

Author: trask

.github/renovate.json5

@@ -65,6 +65,16 @@
         'org.mockito:**',
       ],
     },
+    {
+      // snakeyaml-engine 3+ requires Java 11+
+      matchUpdateTypes: [
+        'major',
+      ],
+      enabled: false,
+      matchPackageNames: [
+        'org.snakeyaml:snakeyaml-engine'
+      ],
+    },
     {
       // jqf-fuzz version 1.8+ requires Java 11+
       matchPackageNames: [