fix pixi version

Author: VeckoTheGecko

.github/workflows/ci.yaml

@@ -36,6 +36,9 @@ jobs:
 
   cache-pixi-lock:
     uses: ./.github/workflows/cache-pixi-lock.yml
+    with:
+      pixi-version: "latest"
+
   test:
     name: "${{ matrix.os }} | pixi shell -e ${{ matrix.pixi-env }}"
     runs-on: ${{ matrix.os }}
@@ -92,6 +95,7 @@ jobs:
       - uses: prefix-dev/setup-pixi@v0.9.0
         with:
           cache: true
+          pixi-version: "latest"
           environments: ${{ matrix.pixi-env }}
           cache-write: ${{ github.event_name == 'push' && github.ref_name == 'main' }}