AttributeError: type object Signature has no attribute _encoding

Hi folks!

I'm running into this weird error when running my python code with ray.
Basically I get AttributeError: type object 'Signature' has no attribute '_encoding'.
But it works fine when I run my script without ray...

pygit2 version: v1.12.2
environment: python:3.9.16 docker container.

The error can be reproduced with the code below.
Ray can be installed from PyPi: pip install ray

import pygit2
import ray
from pygit2 import Signature


def function_without_ray():
    org_name = "libgit2"
    repo_name = "pygit2"
    repo = pygit2.clone_repository(
        f"https://github.com/{org_name}/{repo_name}",
        f"/tmp/{repo_name}.git",
    )
    new_branch = repo.branches.create(
        "dummy-branch", repo.revparse_single("HEAD")
    )
    repo.checkout(new_branch)

    index = repo.index
    index.add_all()
    index.write()

    author = Signature("John Doe", "john@doe.com")

    ref = repo.head.name
    tree = index.write_tree()
    parents = [repo.head.target]

    repo.create_commit(
        ref,
        author,
        author,
        "Just a dummy commit",
        tree,
        parents,
    )


@ray.remote
def function_with_ray():
    function_without_ray()

# Comment out one of these function calls to check if it works:
ray.get(function_with_ray.remote())

function_without_ray()

Start by running the provided reproduction in the Python 3.9.16 Docker environment with pygit2 v1.12.2 and Ray installed from PyPI, comparing execution with and without Ray. Trace when Signature loses _encoding and identify a focused regression test; done means the reproduced Ray case no longer raises the AttributeError.