Fix CI (conflicting artifact names)

[mcarbonne]

CI is currently broken because of a breaking change in upload-artifact@v4.
Unlike earlier versions of upload-artifact, uploading to the same artifact via multiple jobs is not supported with v4.

Documentation (https://github.com/actions/upload-artifact):

In matrix scenarios, be careful to not accidentally upload to the same artifact, or else you will encounter conflict errors. It would be best to name the artifact with a prefix or suffix from the matrix:

jobs:
  upload:
    name: Generate Build Artifacts

    strategy:
      matrix:
        os: [ubuntu-latest, windows-latest]
        version: [a, b, c]

    runs-on: ${{ matrix.os }}

    steps:
    - name: Build
      run: ./some-script --version=${{ matrix.version }} > my-binary
    - name: Upload
      uses: actions/upload-artifact@v4
      with:
        name: binary-${{ matrix.os }}-${{ matrix.version }}
        path: my-binary

This will result in artifacts like: binary-ubuntu-latest-a, binary-windows-latest-b, and so on.

I did the same fix in my other PR #557 (comment) but as this isn't related, I opened another dedicated PR.