Update plugin com.diffplug.spotless to v8.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.diffplug.spotless	8.5.1 → 8.6.0

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Warning

Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

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[codspeed-hq]

Merging this PR will degrade performance by 32.19%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

❌ 4 regressed benchmarks
✅ 1271 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	decompress_rd[f32, (100000, 0.01)]	411.9 µs	584.9 µs	-29.57%
❌	Simulation	decompress_rd[f32, (100000, 0.1)]	412 µs	584.9 µs	-29.57%
❌	Simulation	decompress_rd[f64, (100000, 0.1)]	667.6 µs	1,022.6 µs	-34.71%
❌	Simulation	decompress_rd[f64, (100000, 0.01)]	667.6 µs	1,022.5 µs	-34.71%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing renovate/com.diffplug.spotless-8.x (310f658) with develop (57e1784)}