Bump com.diffplug.spotless from 6.6.1 to 6.7.0 (#47)

Bumps com.diffplug.spotless from 6.6.1 to 6.7.0.

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id 'java-library'
-    id 'com.diffplug.spotless' version '6.6.1'
+    id 'com.diffplug.spotless' version '6.7.0'
     id 'me.champeau.jmh' version '0.6.6'
 }