Update to relative import in browsergym_env

[sergiopaniego]

The current approach generates:

OpenEnv/src/envs/browsergym_env/client.py", line 6, in <module>
    from browsergym_env.models import (
ModuleNotFoundError: No module named 'browsergym_env'

when imported the env when installed via pip

cc @Paulescu

[sergiopaniego]

@init27 @pankit-eng @jspisak 😄

[burtenshaw]

@sergiopaniego are you installing the env with uv pip install . ?

[sergiopaniego]

It works with uv pip install . or uv pip install git+https://github.com/meta-pytorch/OpenEnv.git. The case where it fails for me is pip install git+https://github.com/meta-pytorch/OpenEnv.git

[burtenshaw]

Sorry. Just double checked this and it works, but we need to update this docs page to match.

[sergiopaniego]

I think it's already up-to-date. Let me know if it's not the case (https://meta-pytorch.org/OpenEnv/environment-builder/#5-implement-the-client)