fix(deps): update spotless packages to v7 (major) (open-telemetry#1639)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

buildSrc/build.gradle.kts

@@ -1,7 +1,7 @@
 plugins {
   `kotlin-dsl`
   // When updating, update below in dependencies too
-  id("com.diffplug.spotless") version "6.25.0"
+  id("com.diffplug.spotless") version "7.0.1"
 }
 
 repositories {
@@ -12,7 +12,7 @@ repositories {
 
 dependencies {
   // When updating, update above in plugins too
-  implementation("com.diffplug.spotless:spotless-plugin-gradle:6.25.0")
+  implementation("com.diffplug.spotless:spotless-plugin-gradle:7.0.1")
   implementation("net.ltgt.gradle:gradle-errorprone-plugin:4.1.0")
   implementation("net.ltgt.gradle:gradle-nullaway-plugin:2.1.0")
 }