chore: remove animal-sniffer-maven-plugin because it is no longer needed

Author: cortlepp

modules/transport/testkit/pom.xml

@@ -159,15 +159,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <groupId>org.codehaus.mojo</groupId>
-                <artifactId>animal-sniffer-maven-plugin</artifactId>
-                <configuration>
-                    <!-- The doclet uses com.sun APIs and signature verification would fail. That's OK
-                         because the artifact is only used during the build anyway. -->
-                    <skip>true</skip>
-                </configuration>
-            </plugin>
         </plugins>
     </build>
 </project>