chore(ci): bump prefix-dev/setup-pixi from 0.6.0 to 0.8.1

Bumps [prefix-dev/setup-pixi](https://github.com/prefix-dev/setup-pixi) from 0.6.0 to 0.8.1.
- [Release notes](https://github.com/prefix-dev/setup-pixi/releases)
- [Commits](prefix-dev/setup-pixi@v0.6.0...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] <[email protected]>

.github/workflows/rust-compile.yml

@@ -129,7 +129,7 @@ jobs:
       # our implementation will fail on 3.7.4
       # and we emit warning
       - name: Install pixi
-        uses: prefix-dev/setup-pixi@v0.6.0
+        uses: prefix-dev/setup-pixi@v0.8.1
         with:
           run-install: ${{ contains(matrix.name, 'Linux') }}