[libcxx-commits] [libcxx] [libc++] Specify `encoding='utf-8'` in `conformance` script (PR #189534)

[A. Jiang via libcxx-commits]

frederick-vs-ja wrote:

@ldionne I guess I also need to request some permissions. When I ran the script (modified with explicit UTF-8 encoding), I still encountered the following error:
```
GraphQL: frederick-vs-ja does not have the correct permissions to execute `AddProjectV2ItemById` (add_000)
```

https://github.com/llvm/llvm-project/pull/189534