Bump com.diffplug.spotless from 8.7.0 to 8.8.0 in /lib/java (#3692)

Bumps com.diffplug.spotless from 8.7.0 to 8.8.0.

---
updated-dependencies:
- dependency-name: com.diffplug.spotless
  dependency-version: 8.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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