Merge pull request #348 from xdev-software/renovate/org.springframework.boot.version

Update org.springframework.boot.version to v3.5.3

Author: AB-xdev

template-placeholder-demo/pom.xml

@@ -31,7 +31,7 @@
 		<!-- Dependency-Versions -->
 		<vaadin.version>24.7.6</vaadin.version>
 
-		<org.springframework.boot.version>3.5.0</org.springframework.boot.version>
+		<org.springframework.boot.version>3.5.3</org.springframework.boot.version>
 	</properties>
 
 	<dependencyManagement>