fix(deps): update spring boot to v3.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.springframework.boot:spring-boot-dependencies (source)	3.3.6 -> 3.4.0
org.springframework.boot:spring-boot-maven-plugin (source)	3.3.6 -> 3.4.0

---

Release Notes

spring-projects/spring-boot (org.springframework.boot:spring-boot-dependencies)

### [`v3.4.0`](https://redirect.github.com/spring-projects/spring-boot/compare/v3.3.6...v3.4.0) [Compare Source](https://redirect.github.com/spring-projects/spring-boot/compare/v3.3.6...v3.4.0)

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.