Update dependency com.diffplug.spotless:spotless-plugin-gradle to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.diffplug.spotless:spotless-plugin-gradle	7.2.1 → 8.4.0

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[JakeWharton]

Build logic needs to target 17

[oldergod]

@JakeWharton only changing the build logic didn't seem to be enough here e894cec

so I updated everywhere

[JakeWharton]

I don't think we want to apply it everywhere. That makes the library unusable for people on older JVMs.

[oldergod]

Hmm, yes. Reverted for now

[renovate]

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[oldergod]

Very big reformatting with ktlint being bump