Define tcnative as optional again (#12146)

Motivation:

#11745 introduced some change but missed to mark the tcnative classes jar as optional

Modifications:

Mark the dependency as optional again

Result:

Fixes #12101 and #12132

handler/pom.xml

@@ -63,6 +63,7 @@
     <dependency>
       <groupId>${project.groupId}</groupId>
       <artifactId>netty-tcnative-classes</artifactId>
+      <optional>true</optional>
     </dependency>
     <dependency>
       <groupId>${project.groupId}</groupId>

pom.xml

@@ -680,6 +680,7 @@
         <artifactId>netty-tcnative-classes</artifactId>
         <version>${tcnative.version}</version>
         <scope>compile</scope>
+        <optional>true</optional>
       </dependency>
       <dependency>
         <groupId>${project.groupId}</groupId>