CI: Try windows GHA again

.github/workflows/ci_win.yml

@@ -14,25 +14,26 @@ jobs:
       fail-fast: false
       matrix:
         os: ["windows-latest"]
-        python-version: ["3.7"] # "3.10" needs work
+        python-version: ["3.7"]
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
-      - name: Set up Python version ${{ matrix.python-version }}
-        uses: actions/setup-python@v4
+      - name: Set up Mamba
+        uses: conda-incubator/setup-miniconda@v2
         with:
           python-version: ${{ matrix.python-version }}
-          cache: pip
-          cache-dependency-path: pyproject.toml
+          mamba-version: "*"
+          channels: conda-forge,defaults
+          channel-priority: true
 
       - name: Install and test
-        shell: bash -l {0}
+        shell: pwsh -el {0}
         run: |
-          python -m pip install .[test]
-          python -m pip install packaging virtualenv
-          python -m pytest -v -l -x --timeout=300 \
+          python.exe -m pip install .[test]
+          python.exe -m pip install packaging virtualenv
+          python.exe -m pytest -v -l -x --timeout=300 \
           --durations=100 test \
-          --environment-type=virtualenv
+          --environment-type=mamba