Bump com.diffplug.spotless from 6.25.0 to 7.0.2 in /lib/java

Bumps com.diffplug.spotless from 6.25.0 to 7.0.2.

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

Signed-off-by: dependabot[bot] <support@github.com>