Make artefacts available even when pytest fails.

This is to see why the pybind11 3.0.1 build segfaults at the end of pytest.

https://stackoverflow.com/questions/58858429/how-to-run-a-github-actions-step-even-if-the-previous-step-fails-while-still-f

Author: HinTak

.github/workflows/ci.yml

@@ -55,6 +55,7 @@ jobs:
           CIBW_TEST_SKIP: "*-macosx_arm64"
 
       - uses: actions/upload-artifact@v4
+        if: always()
         with:
           name: wheel-${{ matrix.os }}-${{ matrix.arch }}-${{ matrix.cp }}
           path: ./wheelhouse/*.whl
@@ -103,6 +104,7 @@ jobs:
           CIBW_TEST_SKIP: "*-macosx_arm64"
 
       - uses: actions/upload-artifact@v4
+        if: always()
         with:
           name: wheel-${{ matrix.os }}-${{ matrix.arch }}-${{ matrix.cp }}
           path: ./wheelhouse/*.whl