Update vaadin to v24.5.6

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 kotlin = "2.0.21"
 quarkus = "3.15.1"
-vaadin = "24.5.3"
+vaadin = "24.5.6"
 
 [libraries]
 vaadin-bom = { module = "com.vaadin:vaadin-bom", version.ref = "vaadin" }