chore(ci): Update prefix-dev/setup-pixi action to v0.9.4

Author: renovate[bot]

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
           - py310
     steps:
         - uses: actions/checkout@v6
-        - uses: prefix-dev/setup-pixi@v0.9.3
+        - uses: prefix-dev/setup-pixi@v0.9.4
           with:
             pixi-version: "latest"
             environments: ${{ matrix.pixi-environment }}
@@ -33,7 +33,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v6
       - name: Setup Pixi
-        uses: prefix-dev/setup-pixi@v0.9.3
+        uses: prefix-dev/setup-pixi@v0.9.4
       - name: Format and lint
         run: |
           pixi run fmt