Bump the dependencies group with 1 update

Bumps the dependencies group with 1 update: [prefix-dev/setup-pixi](https://github.com/prefix-dev/setup-pixi).


Updates `prefix-dev/setup-pixi` from 0.4.3 to 0.5.0
- [Release notes](https://github.com/prefix-dev/setup-pixi/releases)
- [Commits](prefix-dev/setup-pixi@ca3b9ac...c2a7a27)

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

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

.github/workflows/ci-copier.yml

@@ -21,6 +21,6 @@ jobs:
         with:
           fetch-depth: 0 # copier doesn't like shallow clones
       - name: Set up pixi
-        uses: prefix-dev/setup-pixi@ca3b9ac762955fad216e3d8e0bbf22087071c89c
+        uses: prefix-dev/setup-pixi@c2a7a2709894350902c4ef78eb3c38f5ae15c7f4
       - name: Test
         run: pixi run test