Update tck/src/main/java/io/a2a/tck/server/AgentExecutorProducer.java

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: ethanthopkins

tck/src/main/java/io/a2a/tck/server/AgentExecutorProducer.java

@@ -28,7 +28,7 @@ public AgentExecutor agentExecutor() {
 
     private static class FireAndForgetAgentExecutor implements AgentExecutor {
         @Override
-        public void execute(@Nullable RequestContext context, EventQueue eventQueue) throws JSONRPCError {
+        public void execute(RequestContext context, EventQueue eventQueue) throws JSONRPCError {
             Task task = context.getTask();
 
             if (task == null) {