Update spotless packages to v8.8.0 (signalfx#2916)

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

Author: renovate[bot]

buildSrc/build.gradle.kts

@@ -2,7 +2,7 @@ plugins {
   `kotlin-dsl`
 
   // When updating, update below in dependencies too
-  id("com.diffplug.spotless") version "8.7.0"
+  id("com.diffplug.spotless") version "8.8.0"
 }
 
 spotless {
@@ -40,7 +40,7 @@ repositories {
 dependencies {
   implementation(gradleApi())
 
-  implementation("com.diffplug.spotless:spotless-plugin-gradle:8.7.0")
+  implementation("com.diffplug.spotless:spotless-plugin-gradle:8.8.0")
   implementation("io.opentelemetry.instrumentation:gradle-plugins:2.29.0-alpha")
 
   // keep these versions in sync with settings.gradle.kts