Bump com.diffplug.spotless from 6.5.2 to 6.6.0 (#175)

Bumps com.diffplug.spotless from 6.5.2 to 6.6.0.

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

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

settings.gradle.kts

@@ -21,7 +21,7 @@ includeBuild("build-tools")
 pluginManagement {
   repositories { gradlePluginPortal() }
   plugins {
-    id("com.diffplug.spotless") version "6.5.2"
+    id("com.diffplug.spotless") version "6.6.0"
     id("org.jetbrains.gradle.plugin.idea-ext") version "1.1.4"
     id("com.google.protobuf") version "0.8.18"
     id("me.champeau.jmh") version "0.6.6"