Chore(deps): Bump prefix-dev/setup-pixi in the actions group

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
...

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

Author: dependabot[bot]

.github/workflows/deploy-gh-pages.yml

@@ -18,7 +18,7 @@ jobs:
     - uses: actions/checkout@v6
       with:
         fetch-depth: 0
-    - uses: prefix-dev/setup-pixi@v0.9.3
+    - uses: prefix-dev/setup-pixi@v0.9.4
       with:
         pixi-version: v0.59.0
         environments: doc

.github/workflows/lint.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: prefix-dev/setup-pixi@v0.9.3
+      - uses: prefix-dev/setup-pixi@v0.9.4
         with:
           pixi-version: v0.59.0
           environments: lint

.github/workflows/python-app.yml

@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v6
         with:
           fetch-depth: 0
-      - uses: prefix-dev/setup-pixi@v0.9.3
+      - uses: prefix-dev/setup-pixi@v0.9.4
         with:
           pixi-version: v0.59.0
           environments: ${{ matrix.environment }}