chore(deps): Bump prefix-dev/setup-pixi in the actions group (#117)

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


Updates `prefix-dev/setup-pixi` from 0.9.3 to 0.9.4
- [Release notes](https://github.com/prefix-dev/setup-pixi/releases)
- [Commits](prefix-dev/setup-pixi@v0.9.3...v0.9.4)

---
updated-dependencies:
- dependency-name: prefix-dev/setup-pixi
  dependency-version: 0.9.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

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

Author: dependabot[bot]

.github/workflows/deploy-jupyter-book.yml

@@ -30,7 +30,7 @@ jobs:
     - uses: actions/checkout@v6
 
     - name: Set up pixi
-      uses: prefix-dev/setup-pixi@v0.9.3
+      uses: prefix-dev/setup-pixi@v0.9.4
       with:
         cache: true
         cache-write: ${{ github.event_name == 'push' && github.ref_name == 'main' }}