Bump actions/download-artifact from 7 to 8

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

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/deploy-pypi.yml

@@ -70,7 +70,7 @@ jobs:
       id-token: write  # IMPORTANT: mandatory for trusted publishing
     steps:
       - name: Download all the dists
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: python-package-distributions
           path: dist/
@@ -260,7 +260,7 @@ jobs:
       id-token: write  # IMPORTANT: mandatory for sigstore
     steps:
       - name: Download all the dists
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           pattern: binary-distributions-*
           merge-multiple: true