Bump vertx-core from 4.2.7 to 4.4.0

Bumps [vertx-core](https://github.com/eclipse/vert.x) from 4.2.7 to 4.4.0.
- [Release notes](https://github.com/eclipse/vert.x/releases)
- [Commits](eclipse-vertx/vert.x@4.2.7...4.4.0)

---
updated-dependencies:
- dependency-name: io.vertx:vertx-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

chapter-4/non-blocking-io/pom.xml

@@ -17,7 +17,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
-        <vertx-core.version>4.2.7</vertx-core.version>
+        <vertx-core.version>4.4.0</vertx-core.version>
     </properties>
 
     <dependencies>