Update Vaadin compatibility range to support 3.4 and 3.5

- Vaadin 24.5 has been EOL for a while, starting from the next Vaadin minor, the minimal supported spring boot version is 3.4. so we decided to drop the compatibilityRange [3.3.0, 3.4.0-M1)
- update the compatibilityRange for Vaadin 24.7 to include springboot 3.5 support

See gh-1810

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

Author: ZheSun88

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

@@ -170,9 +170,7 @@ initializr:
         artifactId: vaadin-bom
         versionProperty: vaadin.version
         mappings:
-          - compatibilityRange: "[3.3.0,3.4.0-M1)"
-            version: 24.5.14
-          - compatibilityRange: "[3.4.0,3.5.0-M1)"
+          - compatibilityRange: "[3.4.0,3.6.0-M1)"
             version: 24.7.5
     platform:
       compatibilityRange: "3.3.0"
@@ -350,7 +348,7 @@ initializr:
           artifactId: vaadin-spring-boot-starter
           description: The full-stack web app platform for Spring. Build views fully in Java with Flow, or in React using Hilla.
           bom: vaadin
-          compatibilityRange: "[3.3.0,3.5.0-M1)"
+          compatibilityRange: "[3.4.0,3.6.0-M1)"
           links:
             - rel: guide
               href: https://spring.io/guides/gs/crud-with-vaadin/