[dajiaohuang]

Description

This addresses the provenance and license-recording issues in #5588, #5589, #5590, and #5591:

• Replace the Stack Overflow-attributed Unzip traversal with a direct ZipInputStream/NIO loop; add a synthetic nested-entry regression test.
• Correct the bundled wrapper-script version in LICENSE.txt to Gradle 6.9.1.
• Record the Akka Streams Sink.combine adaptation and its copyright/license attribution.
• Rewrite printErr formatting so it no longer relies on the Scallop-derived snippet.

Validation: git diff --check passed; :tools:admin:compileScala passed; an isolated task-local Scala probe compiled Unzip.scala and extracted synthetic nested entries with the expected contents. The focused Gradle :core:standalone:test --tests org.apache.openwhisk.standalone.UnzipTests did not reach the test: on this Windows host, :core:scheduler:generateProto failed because protoc-gen-pekkoGrpc could not be found. No Docker/WSL test was run.

Related issue and scope

• I opened an issue to propose and discuss this change (Unzip.scala contains Stack Overflow code, not allowed by ASF licensing policy #5588, LICENSE.txt says gradlew/gradlew.bat are from Gradle v5.5, but they are from Gradle 6.9.1 #5589, OwSink.combine is derived from Akka's Sink.combine but has no Lightbend attribution #5590, Admin tool Main.scala contains MIT-licensed code from Scallop without attribution #5591)

My changes affect the following components

• API
• Controller
• Message Bus (e.g., Kafka)
• Loadbalancer
• Scheduler
• Invoker
• Intrinsic actions (e.g., sequences, conductors)
• Data stores (e.g., CouchDB)
• Tests
• Deployment
• CLI
• General tooling
• Documentation

Types of changes

• Bug fix (generally a non-breaking change which closes an issue).
• Enhancement or new feature (adds new functionality).
• Breaking change (a bug fix or enhancement which changes existing behavior).

Checklist

• I signed an Apache CLA.
• I reviewed the style guides and followed the recommendations.
• I added tests to cover my changes.
• My changes require further changes to the documentation.
• I updated the documentation where necessary.

[dgrove-oss]

lgtm. Thank you for the PR