fix: upgrade io.vertx:vertx-core from 4.5.11 to 4.5.21

Snyk has created this PR to upgrade io.vertx:vertx-core from 4.5.11 to 4.5.21.

See this package in maven:
io.vertx:vertx-core

See this project in Snyk:
https://app.snyk.io/org/andriimaliuta/project/a04d75e9-297e-4258-a336-73dff44a7f45?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

pom.xml

@@ -130,7 +130,7 @@
         <dependency>
             <groupId>io.vertx</groupId>
             <artifactId>vertx-core</artifactId>
-            <version>4.5.11</version>
+            <version>4.5.21</version>
         </dependency>
         <dependency>
             <groupId>io.vertx</groupId>