build(deps): bump com.diffplug.spotless from 6.13.0 to 8.1.0

Bumps com.diffplug.spotless from 6.13.0 to 8.1.0.

---
updated-dependencies:
- dependency-name: com.diffplug.spotless
  dependency-version: 8.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

build.gradle

@@ -2,7 +2,7 @@ plugins {
   id 'java-library'
   id 'maven-publish'
   id 'org.jreleaser' version '1.18.0'
-  id "com.diffplug.spotless" version "6.13.0"
+  id "com.diffplug.spotless" version "8.1.0"
 }
 
 java {