chore(deps): bump org.springframework.boot

Bumps the minorandpatch group in /backend with 1 update: [org.springframework.boot](https://github.com/spring-projects/spring-boot).


Updates `org.springframework.boot` from 3.3.3 to 3.3.4
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.3.3...v3.3.4)

---
updated-dependencies:
- dependency-name: org.springframework.boot
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: minorandpatch
...

Signed-off-by: dependabot[bot] <support@github.com>

backend/build.gradle

@@ -2,7 +2,7 @@ import org.gradle.api.tasks.testing.logging.TestExceptionFormat
 import org.gradle.api.tasks.testing.logging.TestLogEvent
 
 plugins {
-    id 'org.springframework.boot' version '3.3.3'
+    id 'org.springframework.boot' version '3.3.4'
     id 'io.spring.dependency-management' version '1.1.6'
     // If kotlin version bumped, check if gradle version can be bumped as well 
     // Check here: https://kotlinlang.org/docs/gradle-configure-project.html#apply-the-plugin