Prepare for Spring Boot 4

[gavlyukovskiy]

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[Copilot]

Pull Request Overview

This PR updates the project to support Spring Boot 4.0.0-M3, a milestone release. The primary change is upgrading from Spring Boot 3.5.6 to 4.0.0-M3 and adapting the codebase to accommodate package relocations and API changes introduced in Spring Boot 4.

Key Changes:

• Upgraded Spring Boot version from 3.5.6 to 4.0.0-M3
• Updated import statements to reflect new package structure (JDBC and Flyway autoconfiguration moved to new packages)
• Replaced Jakarta @PostConstruct/@PreDestroy annotations with Spring's InitializingBean/DisposableBean interfaces

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
gradle/libs.versions.toml	Updated Spring Boot version and reorganized dependency declarations to align with new module structure
P6SpyConfiguration.java	Migrated from Jakarta lifecycle annotations to Spring lifecycle interfaces
FlexyPoolConfiguration.java	Migrated from @PostConstruct to InitializingBean interface
DataSourceDecoratorAutoConfiguration.java	Updated DataSourceAutoConfiguration import to new package location
P6SpyConfigurationTests.java	Updated DataSourceAutoConfiguration import to new package location
FlexyPoolConfigurationTests.java	Updated DataSourceAutoConfiguration import to new package location
ProxyDataSourceConfigurationTests.java	Updated DataSourceAutoConfiguration import to new package location
DataSourceDecoratorAutoConfigurationTests.java	Updated DataSourceAutoConfiguration and FlywayAutoConfiguration imports to new package locations
build.gradle.kts	Updated dependencies to use new granular Spring Boot modules and added Flyway module

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