Bump springBootVersion from 3.4.2 to 3.4.3

Bumps `springBootVersion` from 3.4.2 to 3.4.3.

Updates `org.springframework.boot:spring-boot-configuration-processor` from 3.4.2 to 3.4.3
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.4.2...v3.4.3)

Updates `org.springframework.boot:spring-boot-dependencies` from 3.4.2 to 3.4.3
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.4.2...v3.4.3)

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

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

Author: dependabot[bot]

build.gradle

@@ -25,7 +25,7 @@ group = 'de.otto.synapse'
 
 ext {
     awsSdkVersion = "2.30.8"
-    springBootVersion = "3.4.2"
+    springBootVersion = "3.4.3"
     edisonVersion = "3.4.2"
     testcontainersVersion = "1.20.1"
 }