fix(deps): Update plugin com.diffplug.spotless to v6.25.0 (#175)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| com.diffplug.spotless | plugin | minor | `6.20.0` -> `6.25.0` |

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### Configuration

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Author: cq-bot

lib/build.gradle

@@ -2,7 +2,7 @@ plugins {
     id 'java-library'
     id "io.freefair.lombok" version "8.2.2"
     id "maven-publish"
-    id "com.diffplug.spotless" version "6.20.0"
+    id "com.diffplug.spotless" version "6.25.0"
 }
 
 ext {