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] <[email protected]>

.github/workflows/ci_macos.yml

@@ -59,7 +59,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup pixi
-        uses: prefix-dev/setup-pixi@v0.7.0
+        uses: prefix-dev/setup-pixi@v0.8.1
         with:
           cache: true
 

.github/workflows/ci_ubuntu.yml

@@ -87,7 +87,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup pixi
-        uses: prefix-dev/setup-pixi@v0.7.0
+        uses: prefix-dev/setup-pixi@v0.8.1
         with:
           cache: true
 

.github/workflows/ci_windows.yml

@@ -100,7 +100,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup pixi
-        uses: prefix-dev/setup-pixi@v0.7.0
+        uses: prefix-dev/setup-pixi@v0.8.1
         with:
           cache: true