fix(deps): update dependency org.springframework.boot:spring-boot-sta…

…rter-parent to v3.3.4

playground-backend/pom.xml

@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.3.3</version>
+		<version>3.3.4</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 	<groupId>ch.sbb</groupId>