Bump prefix-dev/setup-pixi from 0.8.14 to 0.9.0 (#320)

Bumps [prefix-dev/setup-pixi](https://github.com/prefix-dev/setup-pixi) from 0.8.14 to 0.9.0.
- [Release notes](https://github.com/prefix-dev/setup-pixi/releases)
- [Commits](prefix-dev/setup-pixi@8ca4608...fef5c95)

---
updated-dependencies:
- dependency-name: prefix-dev/setup-pixi
  dependency-version: 0.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci-additional.yml

@@ -29,7 +29,7 @@ jobs:
           fetch-depth: 0 # fetch all branches and tags
 
       - name: setup environment
-        uses: prefix-dev/setup-pixi@8ca4608ef7f4daeb54f5205b20d0b7cb42f11143 # 0.8.14
+        uses: prefix-dev/setup-pixi@fef5c9568ca6c4ff7707bf840ab0692ba3f08293 # 0.9.0
         with:
           environments: "doctests"
 

.github/workflows/ci.yml

@@ -61,7 +61,7 @@ jobs:
           fetch-depth: 0 # fetch all branches and tags
 
       - name: setup environment
-        uses: prefix-dev/setup-pixi@8ca4608ef7f4daeb54f5205b20d0b7cb42f11143 # 0.8.14
+        uses: prefix-dev/setup-pixi@fef5c9568ca6c4ff7707bf840ab0692ba3f08293 # 0.9.0
         with:
           environments: "${{ matrix.env }}"
 

.github/workflows/nightly.yml

@@ -64,7 +64,7 @@ jobs:
           fetch-depth: 0 # fetch all branches and tags
 
       - name: setup environment
-        uses: prefix-dev/setup-pixi@8ca4608ef7f4daeb54f5205b20d0b7cb42f11143 # 0.8.14
+        uses: prefix-dev/setup-pixi@fef5c9568ca6c4ff7707bf840ab0692ba3f08293 # 0.9.0
         with:
           environments: "nightly"