dependabot: bump com.diffplug.spotless from 8.0.0 to 8.1.0

Bumps com.diffplug.spotless from 8.0.0 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-minor
...

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

Author: dependabot[bot]

build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id 'com.diffplug.spotless' version '8.0.0' apply false
+    id 'com.diffplug.spotless' version '8.1.0' apply false
     id "net.ltgt.errorprone" version "4.3.0"
 }