chore(deps): update dependency org.mock-server:mockserver-netty-no-dependencies to v6

Author: renovate[bot]

prometheus-metrics-exporter-pushgateway/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>org.mock-server</groupId>
       <artifactId>mockserver-netty-no-dependencies</artifactId>
-      <version>5.15.0</version>
+      <version>6.0.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>