Upgrade Spring Boot 3.3.5 -> 3.4.0 (#1435)

See:
- https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.4-Release-Notes
- https://github.com/spring-projects/spring-boot/releases/tag/v3.3.6
- https://github.com/spring-projects/spring-boot/releases/tag/v3.4.0-M1
- https://github.com/spring-projects/spring-boot/releases/tag/v3.4.0-M2
- https://github.com/spring-projects/spring-boot/releases/tag/v3.4.0-M3
- https://github.com/spring-projects/spring-boot/releases/tag/v3.4.0-RC1
- https://github.com/spring-projects/spring-boot/releases/tag/v3.4.0
- spring-projects/spring-boot@v3.3.5...v3.4.0

pom.xml

@@ -517,7 +517,7 @@
             <dependency>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-test</artifactId>
-                <version>3.3.5</version>
+                <version>3.4.0</version>
             </dependency>
             <dependency>
                 <groupId>org.springframework.security</groupId>