chore(deps): update dependency com.diffplug.spotless:spotless-plugin-gradle to v6 (#61)

| datasource | package                                      | from   | to    |
| ---------- | -------------------------------------------- | ------ | ----- |
| maven      | com.diffplug.spotless:spotless-plugin-gradle | 5.17.1 | 6.0.0 |

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

build.gradle.kts

@@ -12,7 +12,7 @@ buildscript {
   dependencies {
     classpath("com.android.tools.build:gradle:7.0.3")
     classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion")
-    classpath("com.diffplug.spotless:spotless-plugin-gradle:5.17.1")
+    classpath("com.diffplug.spotless:spotless-plugin-gradle:6.0.0")
     classpath("dev.ahmedmourad.nocopy:nocopy-gradle-plugin:1.4.0")
     classpath("org.jacoco:org.jacoco.core:0.8.7")
     classpath("com.vanniktech:gradle-android-junit-jacoco-plugin:0.17.0-SNAPSHOT")