Bump prefix-dev/setup-pixi from 0.7.0 to 0.8.1 (#49)

Author: dependabot[bot]

.github/workflows/main.yml

@@ -33,7 +33,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
           cache: pip
           allow-prereleases: true
-      - uses: prefix-dev/setup-pixi@v0.7.0
+      - uses: prefix-dev/setup-pixi@v0.8.1
         with:
           pixi-version: v0.22.0
           run-install: false