Bump vaadin.version from 14.8.4 to 14.8.6

Bumps `vaadin.version` from 14.8.4 to 14.8.6.

Updates `vaadin-bom` from 14.8.4 to 14.8.6

Updates `vaadin-maven-plugin` from 14.8.4 to 14.8.6

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

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

Author: dependabot[bot]

vaadin-chip-combobox-demo/pom.xml

@@ -40,7 +40,7 @@
 		<failOnMissingWebXml>false</failOnMissingWebXml>
 
 		<!-- Dependency-Versions -->
-		<vaadin.version>14.8.4</vaadin.version>
+		<vaadin.version>14.8.6</vaadin.version>
 	</properties>
 
 		<dependencyManagement>

vaadin-chip-combobox/pom.xml

@@ -59,7 +59,7 @@
 		<failOnMissingWebXml>false</failOnMissingWebXml>
 
 		<!-- Dependency-Versions -->
-		<vaadin.version>14.8.4</vaadin.version>
+		<vaadin.version>14.8.6</vaadin.version>
 	</properties>