Remove guard on windows when relying on h5py to provide h5 DLL

[mgeplf]

No description provided.

[mgeplf]

According to #35 (comment)
this works.

It looks like the CI also used the new h5py wheel:

2026-03-18T08:54:37.7877325Z ##[group]Testing wheel...
2026-03-18T08:54:37.7877476Z 
2026-03-18T08:54:37.7880733Z + 'C:\hostedtoolcache\windows\Python\3.11.9\x64\python.exe' -sS 'C:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\virtualenv-21.1.0.pyz' --activators= --no-periodic-update --pip=26.0.1 --no-setuptools --python 'C:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\python.3.10.11\tools\python.exe' 'C:\Users\runneradmin\AppData\Local\Temp\cibw-run-la0ktc46\cp310-win_amd64\venv-test'
2026-03-18T08:54:38.5131062Z created virtual environment CPython3.10.11.final.0-64-x86_64 in 476ms
2026-03-18T08:54:38.5131933Z   creator CPython3Windows(dest=C:\Users\runneradmin\AppData\Local\Temp\cibw-run-la0ktc46\cp310-win_amd64\venv-test, clear=False, no_vcs_ignore=False, global=False)
2026-03-18T08:54:38.5132807Z   seeder FromAppData(download=False, pip=26.0.1, via=copy, app_data_dir=C:\Users\runneradmin\AppData\Local\pypa\virtualenv\Cache)
2026-03-18T08:54:38.5133325Z     added seed packages: pip==26.0.1
2026-03-18T08:54:38.5439103Z + where python
2026-03-18T08:54:38.5667700Z C:\Users\runneradmin\AppData\Local\Temp\cibw-run-la0ktc46\cp310-win_amd64\venv-test\Scripts\python.exe
2026-03-18T08:54:38.5675212Z C:\Users\runneradmin\AppData\Local\Temp\cibw-run-la0ktc46\cp310-win_amd64\build\venv\Scripts\python.exe
2026-03-18T08:54:38.5824351Z C:\hostedtoolcache\windows\Python\3.11.9\x64\python.exe
2026-03-18T08:54:38.5885330Z C:\hostedtoolcache\windows\Python\3.12.10\x64\python.exe
2026-03-18T08:54:38.6371388Z + pip install -r ./tests/requirement_tests.txt
2026-03-18T08:54:40.1118896Z Collecting h5py>=2.9.0 (from -r ./tests/requirement_tests.txt (line 1))
2026-03-18T08:54:40.2059117Z   Downloading h5py-3.16.0-cp310-cp310-win_amd64.whl.metadata (3.1 kB)