Bump prefix-dev/setup-pixi from 0.7.0 to 0.8.1

Bumps [prefix-dev/setup-pixi](https://github.com/prefix-dev/setup-pixi) from 0.7.0 to 0.8.1.
- [Release notes](https://github.com/prefix-dev/setup-pixi/releases)
- [Commits](prefix-dev/setup-pixi@v0.7.0...v0.8.1)

---
updated-dependencies:
- dependency-name: prefix-dev/setup-pixi
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

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