Update gradle (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.springframework.boot	3.2.0 → 4.0.6
org.jetbrains.kotlin.plugin.spring	1.9.21 → 2.3.21
org.jetbrains.kotlin.jvm	1.9.21 → 2.3.21

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