Fix broken build caused by concurrent PR merges, a SpotBugs error

- apache#9630 and apache#9329 were merged concurrently which caused the master branch
  to break

- fixes SpotBugs error
"Medium: org.apache.pulsar.client.impl.ConsumerBase.NONE_KEY should be
package protected [org.apache.pulsar.client.impl.ConsumerBase]
At ConsumerBase.java:[line 887] MS_PKGPROTECT"

pulsar-client/src/main/java/org/apache/pulsar/client/impl/ConsumerBase.java

@@ -884,7 +884,7 @@ protected void callMessageListener(Message<T> msg) {
         }
     }
 
-    protected static final byte[] NONE_KEY = "NONE_KEY".getBytes(StandardCharsets.UTF_8);
+    static final byte[] NONE_KEY = "NONE_KEY".getBytes(StandardCharsets.UTF_8);
     protected byte[] peekMessageKey(Message<T> msg) {
         byte[] key = NONE_KEY;
         if (msg.hasKey()) {