fix(deps): update spring boot to v4 (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.springframework.boot:spring-boot-starter-test (source)	3.5.8 -> 4.0.0
org.springframework.boot:spring-boot-starter-validation (source)	3.5.8 -> 4.0.0
org.springframework.boot:spring-boot-dependencies (source)	3.5.8 -> 4.0.0

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Release Notes

spring-projects/spring-boot (org.springframework.boot:spring-boot-starter-test)

v4.0.0

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[sonarqubecloud]

Quality Gate passed

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[sonarqubecloud]

Quality Gate passed

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[sonarqubecloud]

Quality Gate passed

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud