Bump vertx-web from 3.6.2 to 3.9.4

Bumps vertx-web from 3.6.2 to 3.9.4.

---
updated-dependencies:
- dependency-name: io.vertx:vertx-web
  dependency-type: direct:production
...

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

pom.xml

@@ -14,7 +14,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
         <jackson.version>2.12.6.1</jackson.version>
-        <vertx.version>3.6.2</vertx.version>
+        <vertx.version>3.9.4</vertx.version>
         <netty.version>4.1.34.Final</netty.version>
         <netty-tcnative.version>2.0.22.Final</netty-tcnative.version>
         <micrometer.version>1.1.1</micrometer.version>