Update plugin com.diffplug.spotless to v8.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.diffplug.spotless	8.7.0 → 8.8.0

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[github-actions]

SpotBugs

Category	Base	New
Bad practice	31	31
Correctness	28	28
Dodgy code	14	14
Internationalization	6	6
Malicious code vulnerability	26	26
Multithreaded correctness	7	7
Performance	7	7
Security	4	4
Total	123	123

[renovate]

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