Bump the actions group across 1 directory with 2 updates (#1129)

Bumps the actions group with 2 updates in the / directory: [prefix-dev/setup-pixi](https://github.com/prefix-dev/setup-pixi) and [codecov/codecov-action](https://github.com/codecov/codecov-action).


Updates `prefix-dev/setup-pixi` from 0.8.1 to 0.8.3
- [Release notes](https://github.com/prefix-dev/setup-pixi/releases)
- [Commits](prefix-dev/setup-pixi@v0.8.1...v0.8.3)

Updates `codecov/codecov-action` from 5.1.2 to 5.4.0
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v5.1.2...v5.4.0)

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

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

Author: dependabot[bot]

.github/workflows/linters.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: prefix-dev/setup-pixi@v0.8.1
+      - uses: prefix-dev/setup-pixi@v0.8.3
         with:
           pixi-version: v0.39.2
           frozen: true

.github/workflows/tests.yml

@@ -37,7 +37,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
-      - uses: prefix-dev/setup-pixi@v0.8.1
+      - uses: prefix-dev/setup-pixi@v0.8.3
         with:
           pixi-version: v0.39.2
           environments: ${{ matrix.environment }}
@@ -49,7 +49,7 @@ jobs:
         run: pixi run -e ${{ matrix.environment }} tests -n 3
 
       - name: Upload coverage reports to Codecov
-        uses: codecov/codecov-action@v5.1.2
+        uses: codecov/codecov-action@v5.4.0
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           slug: scikit-learn-contrib/imbalanced-learn