Upgrade to Vaadin 24.8.0

See gh-1842

Signed-off-by: Zhe Sun <31067185+ZheSun88@users.noreply.github.com>

Author: ZheSun88

start-site/src/main/resources/application.yml

@@ -172,8 +172,10 @@ initializr:
         artifactId: vaadin-bom
         versionProperty: vaadin.version
         mappings:
-          - compatibilityRange: "[3.4.0,3.6.0-M1)"
+          - compatibilityRange: "[3.4.0,3.5.0-M1)"
             version: 24.7.6
+          - compatibilityRange: "[3.5.0,3.6.0-M1)"
+            version: 24.8.0
     platform:
       compatibilityRange: "3.3.0"
   dependencies: