run free-threaded CI on MacOS and Windows

.github/workflows/ci.yml

@@ -552,7 +552,11 @@ jobs:
 
   test-free-threaded:
     needs: [fmt]
-    runs-on: ubuntu-latest
+    name: Free threaded tests - ${{ matrix.runner }}
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      matrix:
+        runner: ["ubuntu-latest", "windows-latest", "macos-latest"]
     steps:
       - uses: actions/checkout@v4
       - uses: Swatinem/rust-cache@v2
@@ -561,11 +565,10 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: rust-src
-      # TODO: replace with setup-python when there is support
-      - uses: deadsnakes/[email protected]
+      # TODO: replace with actions/setup-python when there is support
+      - uses: quansight-labs/[email protected]
         with:
-          python-version: '3.13-dev'
-          nogil: true
+          python-version: '3.13t'
       - name: Install cargo-llvm-cov
         uses: taiki-e/install-action@cargo-llvm-cov
       - run: python3 -m sysconfig