build(deps): bump org.springframework.boot:spring-boot-starter-log4j2

Bumps [org.springframework.boot:spring-boot-starter-log4j2](https://github.com/spring-projects/spring-boot) from 3.5.4 to 3.5.6.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v3.5.4...v3.5.6

)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter-log4j2
  dependency-version: 3.5.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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