Upgrade to Vaadin 24.7.6

See gh-1817

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

Author: ZheSun88

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

@@ -169,7 +169,7 @@ initializr:
         versionProperty: vaadin.version
         mappings:
           - compatibilityRange: "[3.4.0,3.6.0-M1)"
-            version: 24.7.5
+            version: 24.7.6
     platform:
       compatibilityRange: "3.3.0"
   dependencies: