Bump actions/download-artifact from 7 to 8 (#8271)

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
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -445,7 +445,7 @@ jobs:
           node-version-file: .nvmrc
 
       - name: Download artifacts
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           pattern: "@(binaries-*|lib-ocaml)"
 
@@ -475,7 +475,7 @@ jobs:
           ssh-key: ${{ secrets.RESCRIPT_LANG_ORG_DEPLOY_KEY }}
 
       - name: Download artifacts
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           artifact-ids: ${{ needs.build-compiler.outputs.api-docs-artifact-id }}
           path: data/api
@@ -680,7 +680,7 @@ jobs:
           registry-url: https://registry.npmjs.org # Needed to make auth work for publishing
 
       - name: Download artifacts
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           pattern: "@(binaries-*|lib-ocaml)"