CI: print Python diagnosis on Windows

Author: Chris00

.github/workflows/rust.yml

@@ -31,11 +31,20 @@ jobs:
           - build: win64
             os: windows-latest
             rust: stable
+          - build: anaconda win64
+            os: windows-latest
+            rust: stable
     steps:
     - uses: actions/checkout@master
+    - name: Diagnose Python used (Windows)
+      if: ${{ matrix.os == 'windows-latest' && ! startsWith(matrix.build, 'anaconda') }}
+      shell: pwsh
+      run: |
+        python -c "import sys, platform; print(sys.executable); print(sys.version); print(platform.platform())"
+        python -c "import numpy, matplotlib; print('numpy', numpy.__version__); print('matplotlib', matplotlib.__version__)"
     - uses: actions/setup-python@v6
       with:
-        python-version: '3.12'
+        python-version: '3.14'
       if: ${{ ! startsWith(matrix.build, 'anaconda') }}
     - name: Install Matplotlib (pip)
       run: python3 -m pip install -U matplotlib