chore(deps): update dependency com.diffplug.spotless:spotless-plugin-gradle to v6.8.0

Author: renovate[bot]

buildSrc/build.gradle.kts

@@ -34,7 +34,7 @@ repositories {
 
 dependencies {
     implementation("org.jetbrains.kotlinx:atomicfu-gradle-plugin:0.17.2")
-    implementation("com.diffplug.spotless:spotless-plugin-gradle:6.7.2")
+    implementation("com.diffplug.spotless:spotless-plugin-gradle:6.8.0")
     implementation("org.jetbrains.dokka:dokka-gradle-plugin:1.6.21")
     implementation(kotlin("gradle-plugin", version = "1.6.21"))
     implementation(kotlin("serialization", version = "1.6.21"))