Allow documentation builds on Windows

[A5rocks]

Fixes #3071

I'm not totally sure about all changes here. Some are likely only because my local installation of Python is 3.13.

Also this is definitely not the cleanest method of doing this :P

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00000%. Comparing base (efd785a) to head (03a78ca).

Additional details and impacted files

@@               Coverage Diff               @@
##                 main        #3227   +/-   ##
===============================================
  Coverage   100.00000%   100.00000%           
===============================================
  Files             127          127           
  Lines           19257        19266    +9     
  Branches         1301         1303    +2     
===============================================
+ Hits            19257        19266    +9     

Files with missing lines	Coverage Δ
src/trio/_channel.py	100.00000% <ø> (ø)
src/trio/_core/__init__.py	100.00000% <100.00000%> (ø)
src/trio/_core/_run.py	100.00000% <ø> (ø)
src/trio/_highlevel_socket.py	100.00000% <100.00000%> (ø)
src/trio/_path.py	100.00000% <100.00000%> (ø)
src/trio/_tests/test_unix_pipes.py	100.00000% <ø> (ø)
src/trio/_timeouts.py	100.00000% <ø> (ø)
src/trio/_unix_pipes.py	100.00000% <ø> (ø)
src/trio/lowlevel.py	100.00000% <100.00000%> (ø)

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[TeamSpen210]

Makes sense to me. I've always just ignored the FDStream error in logs when building, since I didn't need to test that bit.

[jakkdl]

I'm not totally sure about all changes here. Some are likely only because my local installation of Python is 3.13.

you can test this with tox -e docs, though you'll either need to manually modify the base_python variable between runs or change the definition to [testenv:py{39,310,311,312,313}-docs]

Or rather, .readthedocs.yml and the docs environment both specify 3.11, so you don't need to verify on any other versions. We might want to bump from 311 to 313 though

[A5rocks]

so you don't need to verify on any other versions

Yeah, I don't remember what I was thinking when writing that initial comment (probably was just because I wasn't sure RTD would pass...)