Drop "special snowflake" Windows from regular CI tests

.github/workflows/ci.yml

@@ -46,32 +46,3 @@ jobs:
     uses: ./.github/workflows/os.yml
     needs:
       - tests
-  windows:
-    needs:
-      - tests
-    runs-on: windows-2022
-    env:
-      PYTEST_ADDOPTS: --verbose
-      CFLAGS: -Wall -Wpedantic -Werror -std=c17
-    defaults:
-      run:
-        shell: msys2 {0}
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-      - uses: msys2/setup-msys2@v2
-        with:
-          update: true
-          install: >-
-            git
-            gmp-devel
-            python-pip
-            mingw-w64-x86_64-meson
-            mingw-w64-x86_64-gcc
-      - run: |
-          python -m venv .test-venv
-          source .test-venv/bin/activate
-          python -m pip install --upgrade pip
-          pip --verbose install .[tests] -Csetup-args=-Dbuildtype=debug
-          pytest

.github/workflows/os.yml

@@ -8,13 +8,6 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-24.04, ubuntu-24.04-arm, macos-14]
-        shell: [bash]
-#       include:
-#         - os: windows-2022
-#           shell: 'msys2 {0}'
-    defaults:
-      run:
-        shell: ${{ matrix.shell }}
     env:
       PYTEST_ADDOPTS: --verbose
       CFLAGS: -Wpedantic -Werror -std=c17
@@ -25,16 +18,6 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: "3.x"
-      - uses: msys2/setup-msys2@v2.27.0
-        with:
-          install: >-
-            mingw-w64-ucrt-x86_64-pkg-config
-            mingw-w64-ucrt-x86_64-gcc
-            autotools
-            patch
-          msystem: ucrt64
-          path-type: inherit
-        if: ${{ startsWith(matrix.os, 'windows') }}
       - name: Cache GNU GMP builds
         id: cache-gmp
         uses: actions/cache@v4