Upload Windows wheel artifacts.

Keep these for 7 days in case anyone is testing them this way.

Author: HexDecimal

.github/workflows/python-package.yml

@@ -152,7 +152,13 @@ jobs:
         with:
           name: sdist
           path: dist/tcod-*.tar.gz
-          retention-days: 3
+          retention-days: 7
+      - uses: actions/upload-artifact@v2
+        if: runner.os == 'Windows'
+        with:
+          name: wheels-windows
+          path: dist/*.whl
+          retention-days: 7
 
   isolated: # Test installing the package from source.
     needs: build
@@ -224,9 +230,9 @@ jobs:
       - name: Archive wheel
         uses: actions/upload-artifact@v2
         with:
-          name: wheel-linux
+          name: wheels-linux
           path: wheelhouse/*.whl
-          retention-days: 1
+          retention-days: 7
       - name: Upload to PyPI
         if: startsWith(github.ref, 'refs/tags/')
         env:
@@ -266,9 +272,9 @@ jobs:
       - name: Archive wheel
         uses: actions/upload-artifact@v2
         with:
-          name: wheel-macos
+          name: wheels-macos
           path: wheelhouse/*.whl
-          retention-days: 1
+          retention-days: 7
       - name: Upload to PyPI
         if: startsWith(github.ref, 'refs/tags/')
         env: