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](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>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -71,7 +71,7 @@ jobs:
       uses: actions/setup-dotnet@v5
       with:
         dotnet-version: 8.0.x
-    - uses: actions/download-artifact@v7
+    - uses: actions/download-artifact@v8
       with:
         name: artifacts
         path: ./artifacts