ci: bump actions/download-artifact from 7 to 8 (#325)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: l0ng-ai <ysdpk123@gmail.com>

.github/workflows/nightly.yml

@@ -166,7 +166,7 @@ jobs:
       - name: Fetch the bundled Linux server
         if: matrix.os == 'windows'
         continue-on-error: true
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: nightly-tty7-server-linux-x86_64-musl
           path: tty7/bundled-server

.github/workflows/release.yml

@@ -125,7 +125,7 @@ jobs:
       - name: Fetch the bundled Linux server
         if: matrix.os == 'windows'
         continue-on-error: true
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: release-tty7-server-linux-x86_64-musl
           path: tty7/bundled-server