Link to OpenBLAS for MINGW64 of MSYS2

Author: zoziha

.github/workflows/ci_windows.yml

@@ -38,6 +38,7 @@ jobs:
           mingw-w64-${{ matrix.arch }}-python-setuptools
           mingw-w64-${{ matrix.arch }}-cmake
           mingw-w64-${{ matrix.arch }}-ninja
+          mingw-w64-${{ matrix.arch }}-openblas
 
     - name: Setup msys POSIX environment
       uses: msys2/setup-msys2@v2