fix(deps): update spotless packages to v8.6.0 (#18861)

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

Author: renovate[bot]

benchmark-overhead/build.gradle.kts

@@ -1,6 +1,6 @@
 plugins {
   id("java")
-  id("com.diffplug.spotless") version "8.5.1"
+  id("com.diffplug.spotless") version "8.6.0"
 }
 
 spotless {

conventions/build.gradle.kts

@@ -1,7 +1,7 @@
 plugins {
   `kotlin-dsl`
   // When updating, update below in dependencies too
-  id("com.diffplug.spotless") version "8.5.1"
+  id("com.diffplug.spotless") version "8.6.0"
 }
 
 spotless {
@@ -54,7 +54,7 @@ dependencies {
   implementation("org.apache.maven:maven-aether-provider:3.3.9")
 
   // When updating, update above in plugins too
-  implementation("com.diffplug.spotless:spotless-plugin-gradle:8.5.1")
+  implementation("com.diffplug.spotless:spotless-plugin-gradle:8.6.0")
   implementation("com.google.guava:guava:33.6.0-jre")
   implementation("com.gradleup.shadow:shadow-gradle-plugin:9.4.1") {
     // plexus-xml 4.1+ pulls in Maven 4 API which uses JPMS-only service registration,

examples/distro/buildSrc/build.gradle.kts

@@ -8,6 +8,6 @@ repositories {
 }
 
 dependencies {
-  implementation("com.diffplug.spotless:spotless-plugin-gradle:8.5.1")
+  implementation("com.diffplug.spotless:spotless-plugin-gradle:8.6.0")
   implementation("com.gradleup.shadow:shadow-gradle-plugin:9.4.1")
 }

examples/extension/build.gradle.kts

@@ -13,7 +13,7 @@ plugins {
   See https://imperceptiblethoughts.com/shadow/ for more details about Shadow plugin.
    */
   id("com.gradleup.shadow") version "9.4.1"
-  id("com.diffplug.spotless") version "8.5.1"
+  id("com.diffplug.spotless") version "8.6.0"
 
   id("io.opentelemetry.instrumentation.muzzle-generation") version "2.29.0-alpha-SNAPSHOT"
   id("io.opentelemetry.instrumentation.muzzle-check") version "2.29.0-alpha-SNAPSHOT"