Remove MinGW CI jobs

Signed-off-by: Darby Johnston <darbyjohnston@yahoo.com>

Author: darbyjohnston

.github/workflows/python-package.yml

@@ -99,7 +99,6 @@ jobs:
           - { os: macos-latest, shell: bash }
           - { os: macos-13, shell: bash }
           - { os: windows-latest, shell: pwsh }
-          - { os: windows-latest, shell: msys2, python-version: 'mingw64' }
         exclude:
           - { os: macos-latest, python-version: 3.9 }
 
@@ -115,20 +114,7 @@ jobs:
     - uses: actions/checkout@v4
       with:
         submodules: 'recursive'
-    - name: Set up MSYS2
-      if: matrix.python-version == 'mingw64'
-      uses: msys2/setup-msys2@v2
-      with:
-        msystem: mingw64
-        install: >-
-          mingw-w64-x86_64-python
-          mingw-w64-x86_64-python-pip
-          mingw-w64-x86_64-gcc
-          mingw-w64-x86_64-cmake
-          make
-          git
     - name: Set up Python ${{ matrix.python-version }}
-      if: matrix.python-version != 'mingw64'
       uses: actions/setup-python@v5.4.0
       with:
         python-version: ${{ matrix.python-version }}