Bump spring.version from 3.0.2 to 3.4.0 in /qendpoint-backend

Bumps `spring.version` from 3.0.2 to 3.4.0.

Updates `org.springframework.boot:spring-boot-starter-web` from 3.0.2 to 3.4.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.0.2...v3.4.0)

Updates `org.springframework.boot:spring-boot-starter-security` from 3.0.2 to 3.4.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.0.2...v3.4.0)

Updates `org.springframework.boot:spring-boot-devtools` from 3.0.2 to 3.4.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.0.2...v3.4.0)

Updates `org.springframework.boot:spring-boot-starter-actuator` from 3.0.2 to 3.4.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.0.2...v3.4.0)

Updates `org.springframework.boot:spring-boot-starter-test` from 3.0.2 to 3.4.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.0.2...v3.4.0)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter-web
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.springframework.boot:spring-boot-starter-security
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.springframework.boot:spring-boot-devtools
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.springframework.boot:spring-boot-starter-actuator
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.springframework.boot:spring-boot-starter-test
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

qendpoint-backend/pom.xml

@@ -44,7 +44,7 @@
         <junit.version>4.13.2</junit.version>
         <lwjgl.version>3.3.1</lwjgl.version>
         <rdf4j.version>5.0.2</rdf4j.version>
-        <spring.version>3.0.2</spring.version>
+        <spring.version>3.4.0</spring.version>
         <logback.version>1.4.5</logback.version>
 
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>