Review fixes for netty-common-4.0:javaagent (open-telemetry#17554)

Co-authored-by: otelbot <197425009+otelbot@users.noreply.github.com>

Author: otelbot[bot]

instrumentation/netty/netty-common-4.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/netty/common/v4_0/AbstractNettyChannelPipelineInstrumentation.java

@@ -106,7 +106,7 @@ public static class RemoveByClassAdvice {
     @Advice.OnMethodEnter(suppress = Throwable.class)
     public static void removeHandler(
         @Advice.This ChannelPipeline pipeline,
-        @Advice.Argument(0) Class<ChannelHandler> handlerClass) {
+        @Advice.Argument(0) Class<? extends ChannelHandler> handlerClass) {
       ChannelHandler handler = pipeline.get(handlerClass);
       if (handler == null) {
         return;