fix: make test suite pass on Windows and Python 3.12+

[MelvinjoseC]

• Fix event loop issues in ASGI tests under newer asgiref by wrapping communicator setup in an async coroutine run on the loop.
• Fix mmap file locking (PermissionError: [WinError 32]) on Windows in multiprocess tests by closing open database handles before unlinking/removing directories.
• Skip case-sensitive env var deprecation warning assertion on Windows where environment variables are case-insensitive.
• Conditionally define the parser benchmark test to avoid failure when pytest-benchmark is not installed.

[csmarchbanks]

Thanks!

A few lint errors and such in CI, but generally I am happy with this. Would you also be interested in adding a CI pipeline for windows to avoid regressions? Just one python version is probably enough.

[MelvinjoseC]

Thanks for the feedback! I've fixed the remaining lint/type issues and added a Windows CI job using Python 3.12. All local checks pass, and GitHub Actions are now running.

[csmarchbanks]

Thanks! Everything looks good now, but the DCO needs to be signed on your most recent commit.

[MelvinjoseC]

Thanks! I've added the DCO sign-off to the latest commit. The DCO check is now passing. The remaining CI workflow is awaiting maintainer approval.

[csmarchbanks]

Thanks!