build(deps): bump actions/download-artifact from 7.0.0 to 8.0.0

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 7.0.0 to 8.0.0.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](37930b1c2a...70fc10c6e5)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: 8.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/ci.yml

@@ -182,7 +182,7 @@ jobs:
     steps:
     - uses: actions/checkout@v6
     - name: Download installer tarball
-      uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
+      uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8.0.0
       with:
         name: installer-${{matrix.os}}
         path: out
@@ -232,7 +232,7 @@ jobs:
           repository: NixOS/flake-regressions-data
           path: flake-regressions/tests
       - name: Download installer tarball
-        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
+        uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8.0.0
         with:
           name: installer-linux
           path: out