Drop non-locked pipenv test on Windows entirely

`pipenv` is picking the 32-bit Python when it should prefer the
architecture-matching 64-bit Python. I don't know why this happens.
It looks like it might be a bug in `pipenv` but I am not sure.

This isn't worth fixing unless development is to be resumed and
alternatives to `pipenv` (such as `uv`) turn out to be unsuitable.
Instead, this commit drops the Windows jobs in `pytest-pipenv`. All
the other Windows jobs are kept: the locked `pipenv` test job for
Windows in `pytest-pipenv-lock`, as well as the seven Windows
`conda` jobs in `pytest-conda`.

Author: EliahKagan

.github/workflows/test.yml

@@ -92,7 +92,7 @@ jobs:
         os:
           - ubuntu-latest
           - macos-latest
-          - windows-latest
+          # - windows-latest
         python-version:
           # - '3.13t'
           - '3.13'
@@ -131,16 +131,8 @@ jobs:
               -pyver=${{ matrix.python-version }} Pipfile
 
       - name: Set up Python
-        if: matrix.os != 'windows-latest'
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-
-      - name: Set up Python
-        if: matrix.os == 'windows-latest'
         uses: actions/setup-python@v5
         with:
-          architecture: x64
           python-version: ${{ matrix.python-version }}
 
       - name: Upgrade PyPA packages