Update plugin com.diffplug.spotless to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.diffplug.spotless	6.25.0 → 8.5.1

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[github-actions]

Qodana Community for JVM

It seems all right 👌

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[codacy-production]

Up to standards ✅

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