Bump com.diffplug.spotless from 6.12.0 to 6.12.1 in /examples/extension (#7502)

Bumps com.diffplug.spotless from 6.12.0 to 6.12.1.


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examples/extension/build.gradle

@@ -11,7 +11,7 @@ plugins {
   See https://imperceptiblethoughts.com/shadow/ for more details about Shadow plugin.
    */
   id "com.github.johnrengelman.shadow" version "7.1.2"
-  id "com.diffplug.spotless" version "6.12.0"
+  id "com.diffplug.spotless" version "6.12.1"
 
   id "io.opentelemetry.instrumentation.muzzle-generation" version "1.22.0-alpha-SNAPSHOT"
   id "io.opentelemetry.instrumentation.muzzle-check" version "1.22.0-alpha-SNAPSHOT"