Bump vaadin.version from 25.1.5 to 25.1.6 (#3100)

Bumps `vaadin.version` from 25.1.5 to 25.1.6.

Updates `com.vaadin:vaadin-bom` from 25.1.5 to 25.1.6

Updates `com.vaadin:vaadin-maven-plugin` from 25.1.5 to 25.1.6
- [Release notes](https://github.com/vaadin/platform/releases)
- [Commits](https://github.com/vaadin/platform/compare/25.1.5...25.1.6)

---
updated-dependencies:
- dependency-name: com.vaadin:vaadin-bom
  dependency-version: 25.1.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.vaadin:vaadin-maven-plugin
  dependency-version: 25.1.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

hawkbit-ui/pom.xml

@@ -24,7 +24,7 @@
     <name>hawkBit :: UI</name>
 
     <properties>
-        <vaadin.version>25.1.5</vaadin.version>
+        <vaadin.version>25.1.6</vaadin.version>
     </properties>
 
     <dependencyManagement>