Update setup-pixi workflow (#95)

Author: mfisher87

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

@@ -19,7 +19,7 @@ jobs:
       - name: "Checkout"
         uses: "actions/checkout@v4"
 
-      - uses: "prefix-dev/setup-pixi@v0.8.1"
+      - uses: "prefix-dev/setup-pixi@v0.8.8"
 
       - run: "pixi run render"