fix: set shell to False if running subprocess on Windows

[my1e5]

Description

When running a subprocess through run in cmd.py, if the OS is Windows set shell=False.

Closes #1118 and #1117

Checklist

• Add test cases to all the changes you introduce
• Run ./scripts/format and ./scripts/test locally to ensure this change passes linter check and test
• Test the changes on the local machine manually
• Update the documentation for the changes

Expected behavior

Running rye run cz bump on a Windows machine in a rye-managed project now works.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.58%. Comparing base (120d514) to head (d0fdb2f).
Report is 439 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1124      +/-   ##
==========================================
+ Coverage   97.33%   97.58%   +0.24%     
==========================================
  Files          42       55      +13     
  Lines        2104     2486     +382     
==========================================
+ Hits         2048     2426     +378     
- Misses         56       60       +4     

Flag	Coverage Δ
unittests	97.58% <ø> (+0.24%)	⬆️

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[Lee-W]

Looks like CI is failing on windows. We might need to take a deeper look