Use new pixi version in CI

Author: Flova

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Set up workspace
         uses: prefix-dev/setup-pixi@v0.9.3
         with:
-          pixi-version: v0.59.0
+          pixi-version: v0.63.1
           cache: false  # Disable caching to avoid issues with large pytorch packages
 
       - name: Build