Release workflow now resolves latest promoted merge artifacts instead of stale main-branch runs (#7)

* Initial plan

* fix: ensure release pulls latest promoted merge artifacts

Agent-Logs-Url: https://github.com/Quantinuum/hugrverse-env/sessions/d3f0960d-bc8c-4c12-8a74-382cf4624d81

Co-authored-by: jake-arkinstall <65358059+jake-arkinstall@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jake-arkinstall <65358059+jake-arkinstall@users.noreply.github.com>

Author: Copilot

.github/workflows/release.yml

@@ -54,7 +54,6 @@ jobs:
         uses: dawidd6/action-download-artifact@v6
         with:
           workflow: merge.yml
-          branch: main
           name: main-${{ matrix.dependency }}-${{ matrix.platform }}
           path: dist/${{ matrix.dependency }}-${{ matrix.platform }}
           if_no_artifact_found: fail