The problem is that we first look in py --list-paths, and that returns:

-V:3.12 *        C:\hostedtoolcache\windows\Python\3.12.2\x64\python.exe
-V:3.12-32       C:\hostedtoolcache\windows\Python\3.12.2\x86\python.exe
-V:3.11          C:\hostedtoolcache\windows\Python\3.11.8\x64\python.exe
-V:3.11-32       C:\hostedtoolcache\windows\Python\3.11.8\x86\python.exe
-V:3.10          C:\hostedtoolcache\windows\Python\3.10.11\x64\python.exe
-V:3.10-32       C:\hostedtoolcache\windows\Python\3.10.11\x86\python.exe
-V:3.9           C:\hostedtoolcache\windows\Python\3.9.13\x64\python.exe
-V:3.9-32        C:\hostedtoolcache\windows\Python\3.9.13\x86\python.exe
-V:3.8           C:\hostedtoolcache\windows\Python\3.8.10\x64\python.exe
-V:3.8-32        C:\hostedtoolcache\windows\Python\3.8.10\x86\python.exe
-V:3.7           C:\hostedtoolcache\windows\Python\3.7.9\x64\python.exe
-V:3.7-32        C:\hostedtoolcache\windows\Python\3.7.9\x86\python.exe

So that ends up returning the Python 3.12.2 interpreter that comes pre-bundled in the cache.

--system doesn't work on Windows on Python <3.12 in GitHub Actions #2056

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