Bump com.diffplug.spotless from 7.0.2 to 8.7.0

Bumps com.diffplug.spotless from 7.0.2 to 8.7.0.

---
updated-dependencies:
- dependency-name: com.diffplug.spotless
  dependency-version: 8.7.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -5,7 +5,7 @@ junit = "5.11.4"
 junit-platform = "1.11.4"
 assertj = "3.27.0"
 
-spotless = "7.0.2"
+spotless = "8.7.0"
 vanniktech-publish = "0.30.0"
 
 [libraries]