Bump com.diffplug.spotless:spotless-plugin-gradle from 6.19.0 to 6.20.0 in /examples/distro (#8979)

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examples/distro/build.gradle

@@ -12,7 +12,7 @@ buildscript {
     }
   }
   dependencies {
-    classpath "com.diffplug.spotless:spotless-plugin-gradle:6.19.0"
+    classpath "com.diffplug.spotless:spotless-plugin-gradle:6.20.0"
     classpath "gradle.plugin.com.github.johnrengelman:shadow:8.0.0"
     classpath "io.opentelemetry.instrumentation:gradle-plugins:1.29.0-alpha-SNAPSHOT"
   }