fix(deps): Update plugin com.diffplug.spotless to v8 (#381)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| com.diffplug.spotless | plugin | major | `7.2.1` -> `8.0.0` |

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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 "8.14.2"
     id "maven-publish"
-    id "com.diffplug.spotless" version "7.2.1"
+    id "com.diffplug.spotless" version "8.0.0"
 }
 
 group 'io.cloudquery'