Force Python version in GH MSVC test

.github/workflows/compile-msvc.yml

@@ -17,9 +17,15 @@ jobs:
       with:
         fetch-depth: 2
 
+    - name: Select Python version
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.10'
+
     - name: Building LAMMPS via CMake
       shell: bash
       run: |
+        python3 -m pip install numpy
         cmake -C cmake/presets/windows.cmake \
               -S cmake -B build \
               -D BUILD_SHARED_LIBS=on \