build(atomix): fix netty dependency

netty-bom 4.1.70 contains the changes from pull request
netty/netty#11798, which moved the classes out
of the native modules to make sure the same classes don't end up on the
classpath multiple times. For us it means that we need to depend on both
the native and classes modules. However, since we don't use the native
module directly (only classes that were moved to this classes module),
we need to force the dependency plugin to consider the native module as
used.

atomix/cluster/pom.xml

@@ -55,9 +55,13 @@
       <groupId>io.netty</groupId>
     </dependency>
     <dependency>
+      <groupId>io.netty</groupId>
+      <artifactId>netty-transport-classes-epoll</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>io.netty</groupId>
       <artifactId>netty-transport-native-epoll</artifactId>
       <classifier>linux-x86_64</classifier>
-      <groupId>io.netty</groupId>
     </dependency>
     <dependency>
       <artifactId>commons-math3</artifactId>
@@ -256,6 +260,7 @@
             <!-- dependency used but plugin seems to report a false positive here -->
             <dependency>uk.co.real-logic:sbe-tool</dependency>
             <dependency>net.jqwik:jqwik</dependency>
+            <dependency>io.netty:netty-transport-native-epoll</dependency>
           </usedDependencies>
         </configuration>
       </plugin>