Bump com.diffplug.spotless from 6.14.1 to 6.15.0 (#742)

Bumps com.diffplug.spotless from 6.14.1 to 6.15.0.


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buildSrc/build.gradle.kts

@@ -1,7 +1,7 @@
 plugins {
   `kotlin-dsl`
   // When updating, update below in dependencies too
-  id("com.diffplug.spotless") version "6.14.1"
+  id("com.diffplug.spotless") version "6.15.0"
 }
 
 repositories {