Bump org.springframework.boot from 3.3.5 to 3.4.0

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 3.3.5 to 3.4.0.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.3.5...v3.4.0)

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

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

build.gradle

@@ -2,7 +2,7 @@ import com.install4j.gradle.Install4jTask
 import org.gradle.internal.os.OperatingSystem
 
 plugins {
-  id("org.springframework.boot") version "3.3.5"
+  id("org.springframework.boot") version "3.4.0"
   id("com.install4j.gradle") version "11.0.1"
   id("de.undercouch.download") version "5.6.0"
   id("jacoco")