Add pixi version to cache key

Author: VeckoTheGecko

.github/workflows/cache-pixi-lock.yml

@@ -29,7 +29,7 @@ jobs:
         with:
           path: |
             pixi.lock
-          key: ${{ steps.date.outputs.date }}_${{hashFiles('pixi.toml')}}
+          key: ${{ steps.date.outputs.date }}_${{inputs.pixi-version}}_${{hashFiles('pixi.toml')}}
       - uses: prefix-dev/setup-pixi@v0.9.0
         if: ${{ !steps.restore.outputs.cache-hit }}
         with: