Install setuptools for MinGW builds

Author: awvwgk

.github/workflows/ci_windows.yml

@@ -70,6 +70,7 @@ jobs:
           mingw-w64-${{ matrix.arch }}-gcc-fortran
           mingw-w64-${{ matrix.arch }}-python
           mingw-w64-${{ matrix.arch }}-python-pip
+          mingw-w64-${{ matrix.arch }}-python-setuptools
           mingw-w64-${{ matrix.arch }}-cmake
           mingw-w64-${{ matrix.arch }}-ninja