Update shadow plugin (#10153)

examples/distro/build.gradle

@@ -13,7 +13,7 @@ buildscript {
   }
   dependencies {
     classpath "com.diffplug.spotless:spotless-plugin-gradle:6.23.3"
-    classpath "gradle.plugin.com.github.johnrengelman:shadow:8.0.0"
+    classpath "com.github.johnrengelman:shadow:8.1.1"
     classpath "io.opentelemetry.instrumentation:gradle-plugins:1.33.0-alpha-SNAPSHOT"
   }
 }