chore(deps): bump actions/download-artifact from 7 to 8 in the gha-updates group (#796)

Bumps the gha-updates group with 1 update: [actions/download-artifact](https://github.com/actions/download-artifact).


Updates `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
  dependency-group: gha-updates
...

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

Author: dependabot[bot]

.github/workflows/docs-build.yml

@@ -25,7 +25,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6 # deploy needs git credentials
       - name: Download prepared docs
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: docs-html-${{ github.sha }}
           path: docs/build/html