`io_grpc_netty_shaded_netty_tcnative_windows_x86.dll` is unsigned in `grpc-netty-shaded`

[AnthonyJacobs]

What version of gRPC-Java are you using?

1.42.1

What is your environment?

Windows (x86)

What did you expect to see?

The native library io_grpc_netty_shaded_netty_tcnative_windows_x86.dll, bundled inside the grpc-netty-shaded JAR, should be signed with a valid certificate.

What did you see instead?

The DLL is not code-signed, which fails security audits in enterprise environments that require all binaries to be signed.

Steps to reproduce the bug

1. Add io.grpc:grpc-netty-shaded as a dependency.
2. Extract the JAR and locate io_grpc_netty_shaded_netty_tcnative_windows_x86.dll.
3. Check the digital signature — none is present.