Bump vaadin.version from 24.4.13 to 24.6.6

Bumps `vaadin.version` from 24.4.13 to 24.6.6.

Updates `com.vaadin:vaadin-bom` from 24.4.13 to 24.6.6

Updates `com.vaadin:vaadin-maven-plugin` from 24.4.13 to 24.6.6

---
updated-dependencies:
- dependency-name: com.vaadin:vaadin-bom
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: com.vaadin:vaadin-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -30,7 +30,7 @@
 
   <properties>
     <java.version>21</java.version>
-    <vaadin.version>24.4.13</vaadin.version>
+    <vaadin.version>24.6.6</vaadin.version>
     <maven.compiler.source>21</maven.compiler.source>
     <maven.compiler.target>21</maven.compiler.target>
     <jakarta.persistence.version>3.2.0</jakarta.persistence.version>