chore(deps): bump actions/download-artifact from 7 to 8 (#727)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 7 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v7...v8)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/test.yml

@@ -116,7 +116,7 @@ jobs:
             extra-substituters = https://cache.iog.io https://neohaskell.cachix.org
             extra-trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= neohaskell.cachix.org-1:mo2cLaGbwqbrxs9xhqKK8jeNsn3osi7t6XoAmxSZssc=
       - uses: DeterminateSystems/magic-nix-cache-action@v14
-      - uses: actions/download-artifact@v7
+      - uses: actions/download-artifact@v8
         with:
           name: dist-newstyle
           path: dist-newstyle