Update dependency java to v25

[renovate]

This PR contains the following updates:

Package	Update	Change
java	major	21 → 25

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[github-actions]

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[MGaetan89]

Java 25 will be supported in Dokka 2.1.0, which is currently in beta.
As for Detekt, the supported Java version is capped at version 21, as per the release notes for the 2.0 alpha version.

[MGaetan89]

Dokka 2.1.0 is now stable. I'll look at the dedicated PR soon.

[MGaetan89]

Detekt 2.0.0-alpha.1 adds support for Java 25.

[Copilot]

Pull request overview

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Updates the Java toolchain version used by GitHub workflows/config.

Changes:

• Bumps the configured Java version from 21 to 25.

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