Update org.springframework.boot.version to v3.5.7

Author: xdev-renovate

flow-demo/pom.xml

@@ -31,7 +31,7 @@
 		<!-- Dependency-Versions -->
 		<vaadin.version>24.9.3</vaadin.version>
 
-		<org.springframework.boot.version>3.5.6</org.springframework.boot.version>
+		<org.springframework.boot.version>3.5.7</org.springframework.boot.version>
 	</properties>
 
 	<dependencyManagement>