chore: upgrade springboot to 3.4.6 (24.7) (#7633) (#7634)

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

Author: vaadin-bot

pom.xml

@@ -18,7 +18,7 @@
     <properties>
         <maven.compiler.source>17</maven.compiler.source>
         <maven.compiler.target>17</maven.compiler.target>
-        <spring.boot.version>3.4.5</spring.boot.version>
+        <spring.boot.version>3.4.6</spring.boot.version>
         <junit.jupiter.version>5.9.1</junit.jupiter.version>
         <jetty.version>12.0.15</jetty.version>
     </properties>