Bump org.springframework.boot:spring-boot-dependencies

Bumps
[org.springframework.boot:spring-boot-dependencies](https://github.com/spring-projects/spring-boot)
from 3.5.5 to 4.0.1.
- [Release
notes](https://github.com/spring-projects/spring-boot/releases)
-
[Commits](spring-projects/spring-boot@v3.5.5...v4.0.1)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-dependencies
  dependency-version: 4.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: grafjo

README.md

@@ -9,6 +9,7 @@ Use 3.x to access the api via https://api.lexware.io instead of https://api.lexo
 
 | lexoffice-java-sdk | Java | Spring Boot |
 |--------------------|------|-------------|
+| 3.5                | 21   | 4.0.x       |
 | 3.2                | 21   | 3.5.x       |
 | 3.0                | 21   | 3.4.x       |
 | 2.1                | 21   | 3.4.x       |