Remove x86_64-darwin from release-upload workflow

[Jimbo4350]

Changelog

- description: |
    Remove x86_64-darwin from the release-upload workflow; support for it was dropped from the flake in 26b9be512
  type:
    # - feature        # introduces a new feature
    # - breaking     # the API has changed in a breaking way
    # - compatible   # the API has changed but is non-breaking
    # - optimisation # measurable performance improvements
    # - refactoring  # QoL changes
    # - bugfix       # fixes a defect
    # - test         # fixes/modifies tests
    - maintenance  # not directly related to the code
    # - release      # related to a new release preparation
    # - documentation # change in code docs, haddocks...

Context

Commit 26b9be5 ("drop support for x86_64-darwin", April 2026) removed x86_64-darwin from the flake's supportedSystems, but the Release Upload workflow still listed it in its download matrix. Every run since then fails in Download Asset (x86_64-darwin) with:

error: flake '...' does not provide attribute 'hydraJobs.x86_64-darwin.packages.cardano-cli:exe:cardano-cli'

which cancels the remaining downloads and skips Create Release. This is why there is no GitHub release for 11.1.0.0 (run 26503541162 and the re-run 31538755892 both failed this way), and it would break the upcoming 11.2.0.0 upload as well.

This removes x86_64-darwin from the matrix, the tar/checksum loops, and the release file list.

How to trust this PR

Compare with supportedSystems in flake.nix (x86_64-linux, aarch64-linux, aarch64-darwin) plus the win64 cross-build. After merging, gh workflow run "Release Upload" -f target_tag=cardano-cli-11.1.0.0 (and the same for 11.2.0.0) should succeed and publish the GitHub releases.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• Self-reviewed the diff

[Copilot]

Pull request overview

This PR updates the GitHub Actions “Release Upload” workflow to stop attempting to download and publish x86_64-darwin artifacts, aligning the workflow’s matrix with the flake’s supportedSystems (which no longer includes x86_64-darwin).

Changes:

• Remove x86_64-darwin from the workflow download matrix.
• Update the tarball and checksum generation loops to exclude x86_64-darwin.
• Remove the x86_64-darwin tarball from the release asset upload list.

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