CI: bump setup-pixi version

Author: lucascolley

.github/workflows/ci.yml

@@ -61,7 +61,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
 
-      - uses: prefix-dev/setup-pixi@v0.8.0
+      - uses: prefix-dev/setup-pixi@v0.8.1
         with:
           pixi-version: v0.30.0
           cache: true