Bump prefix-dev/setup-pixi from 0.8.5 to 0.8.8 in the actions group (#7637)

Bumps the actions group with 1 update: [prefix-dev/setup-pixi](https://github.com/prefix-dev/setup-pixi).


Updates `prefix-dev/setup-pixi` from 0.8.5 to 0.8.8
- [Release notes](https://github.com/prefix-dev/setup-pixi/releases)
- [Commits](https://github.com/prefix-dev/setup-pixi/compare/v0.8.5...v0.8.8)

---
updated-dependencies:
- dependency-name: prefix-dev/setup-pixi
  dependency-version: 0.8.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jeremy Tuloup <jeremy.tuloup@gmail.com>

.github/workflows/upgrade-jupyterlab-dependencies.yml

@@ -79,7 +79,7 @@ jobs:
             jlpm
             jlpm deduplicate
           fi
-      - uses: prefix-dev/setup-pixi@v0.8.5
+      - uses: prefix-dev/setup-pixi@v0.8.8
         with:
           pixi-version: v0.41.4
           manifest-path: pyproject.toml