chore(deps): bump prefix-dev/setup-pixi from 0.9.0 to 0.9.1

Bumps [prefix-dev/setup-pixi](https://github.com/prefix-dev/setup-pixi) from 0.9.0 to 0.9.1.
- [Release notes](https://github.com/prefix-dev/setup-pixi/releases)
- [Commits](prefix-dev/setup-pixi@v0.9.0...v0.9.1)

---
updated-dependencies:
- dependency-name: prefix-dev/setup-pixi
  dependency-version: 0.9.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci-core.yml

@@ -22,7 +22,7 @@ jobs:
       uses: actions/checkout@v5
 
     - name: 🐍 Setup Pixi
-      uses: prefix-dev/[email protected].0
+      uses: prefix-dev/[email protected].1
 
     - name: ✅ Validate conference data structure
       run: |
@@ -57,7 +57,7 @@ jobs:
       uses: actions/checkout@v5
 
     - name: 🐍 Setup Pixi
-      uses: prefix-dev/[email protected].0
+      uses: prefix-dev/[email protected].1
 
     - name: 🧪 Run Python tests
       run: |
@@ -78,7 +78,7 @@ jobs:
       uses: actions/checkout@v5
 
     - name: 🐍 Setup Pixi
-      uses: prefix-dev/[email protected].0
+      uses: prefix-dev/[email protected].1
 
     - name: 🔍 Run pre-commit hooks
       run: |