Deprecate static ZIPCompressedMessage setLevel API

Agent-Logs-Url: https://github.com/jMonkeyEngine/jmonkeyengine/sessions/bbfe269e-4cd7-4d65-adc9-240b6260bd76

Co-authored-by: riccardobl <4943530+riccardobl@users.noreply.github.com>

Author: Copilot

jme3-networking/src/main/java/com/jme3/network/message/ZIPCompressedMessage.java

@@ -77,7 +77,10 @@ public ZIPCompressedMessage(Message msg, int level) {
      * compression but slowest. Default is 6.
      *
      * @param level The level.
+     * @deprecated Use {@link #setCompressionLevel(int)} to configure an instance-specific
+     * compression level.
      */
+    @Deprecated
     public static void setLevel(int level) {
         defaultCompressionLevel = level;
     }