build(deps): bump rossjrw/pr-preview-action from 1.4.7 to 1.4.8

Bumps [rossjrw/pr-preview-action](https://github.com/rossjrw/pr-preview-action) from 1.4.7 to 1.4.8.
- [Release notes](https://github.com/rossjrw/pr-preview-action/releases)
- [Commits](rossjrw/pr-preview-action@v1.4.7...v1.4.8)

---
updated-dependencies:
- dependency-name: rossjrw/pr-preview-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/docs_preview.yml

@@ -31,7 +31,7 @@ jobs:
           pip install -e .[dev,docs]
           make -C docs html
       - name: Deploy Preview
-        uses: rossjrw/[email protected].7
+        uses: rossjrw/[email protected].8
         with:
           source-dir: docs/_build/html
           preview-branch: gh-pages