Fix poe check on Windows

[nissa-seru]

Why are these changes needed?

poe check fails on main on Windows due to a combination line ending mismatches, Unix-specific commands, and Windows-specific asyncio behavior. This PR attempts to fix this (so that poe check on a freshly-pulled main passes on Windows 11.)

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md to build and test documentation locally.
• None needed,
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• No new tests needed, PR fixes existing tests to run properly on Windows.
• I've made sure all auto checks have passed.
• poe check passes

[nissa-seru]

As a side note, I recommend bumping llama-cpp-python in packages\autogen-ext\pyproject.toml to >=0.3.8. The current value of >=0.1.9 causes uv to default to fetching 0.3.7, at least when I uv sync --all-extras on Python 3.12.8 - which leads to the uv sync failing due to ggml-org/llama.cpp#11836 (the fix for which was pulled into llama-cpp-python as of version 0.3.8 when it updated llama.cpp.) I did not include this bump in the PR, but noting here since probably not worth a separate PR just for the bump.

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 75.76%. Comparing base (b8b7a2d) to head (73e70c4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...t/src/autogen_ext/code_executors/local/__init__.py	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5942      +/-   ##
==========================================
- Coverage   75.77%   75.76%   -0.01%     
==========================================
  Files         191      191              
  Lines       13107    13114       +7     
==========================================
+ Hits         9932     9936       +4     
- Misses       3175     3178       +3     

Flag	Coverage Δ
unittests	75.76% <71.42%> (-0.01%)	⬇️

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