chore: bump protobuf version to 4.33.5

PiperOrigin-RevId: 875675369

Author: tilgalas

pom.xml

@@ -48,7 +48,7 @@
     <mcp.version>0.14.0</mcp.version>
     <errorprone.version>2.47.0</errorprone.version>
     <google.genai.version>1.32.0</google.genai.version>
-    <protobuf.version>4.32.0</protobuf.version>
+    <protobuf.version>4.33.5</protobuf.version>
     <junit.version>5.11.4</junit.version>
     <mockito.version>5.20.0</mockito.version>
     <java-websocket.version>1.6.0</java-websocket.version>