Bump springBootVersion from 3.3.4 to 3.4.1

Bumps `springBootVersion` from 3.3.4 to 3.4.1.

Updates `org.springframework.boot:spring-boot-configuration-processor` from 3.3.4 to 3.4.1
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.3.4...v3.4.1)

Updates `org.springframework.boot:spring-boot-dependencies` from 3.3.4 to 3.4.1
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.3.4...v3.4.1)

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

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

build.gradle

@@ -25,7 +25,7 @@ group = 'de.otto.synapse'
 
 ext {
     awsSdkVersion = "2.28.9"
-    springBootVersion = "3.3.4"
+    springBootVersion = "3.4.1"
     edisonVersion = "3.3.2"
     testcontainersVersion = "1.20.1"
 }