build(deps-dev): bump com.fizzed:rocker-maven-plugin from 2.2.1 to 2.4.0

Bumps [com.fizzed:rocker-maven-plugin](https://github.com/fizzed/rocker) from 2.2.1 to 2.4.0.
- [Changelog](https://github.com/fizzed/rocker/blob/master/CHANGELOG.md)
- [Commits](fizzed/rocker@v2.2.1...v2.4.0)

---
updated-dependencies:
- dependency-name: com.fizzed:rocker-maven-plugin
  dependency-version: 2.4.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

vertx-mutiny-clients/vertx-mutiny-web-templ-rocker/pom.xml

@@ -171,7 +171,7 @@
             <plugin>
                 <groupId>com.fizzed</groupId>
                 <artifactId>rocker-maven-plugin</artifactId>
-                <version>2.2.1</version>
+                <version>2.4.0</version>
                 <executions>
                     <execution>
                         <id>generate-rocker-templates</id>