Bump the actions group across 1 directory with 3 updates

Bumps the actions group with 3 updates in the / directory: [actions/checkout](https://github.com/actions/checkout), [prefix-dev/setup-pixi](https://github.com/prefix-dev/setup-pixi) and [codecov/codecov-action](https://github.com/codecov/codecov-action).


Updates `actions/checkout` from 4 to 5
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

Updates `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@v0.8.14...v0.9.0)

Updates `codecov/codecov-action` from 5.4.3 to 5.5.0
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v5.4.3...v5.5.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: prefix-dev/setup-pixi
  dependency-version: 0.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
- dependency-name: codecov/codecov-action
  dependency-version: 5.5.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
...

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

Author: dependabot[bot]

.github/workflows/linters.yml

@@ -14,8 +14,8 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
-      - uses: prefix-dev/setup-pixi@v0.8.14
+      - uses: actions/checkout@v5
+      - uses: prefix-dev/setup-pixi@v0.9.0
         with:
           pixi-version: v0.51.0
           frozen: true

.github/workflows/tests.yml

@@ -37,8 +37,8 @@ jobs:
               environment: ci-py311-latest-tensorflow
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
-      - uses: prefix-dev/setup-pixi@v0.8.14
+      - uses: actions/checkout@v5
+      - uses: prefix-dev/setup-pixi@v0.9.0
         with:
           pixi-version: v0.51.0
           environments: ${{ matrix.environment }}
@@ -50,7 +50,7 @@ jobs:
         run: pixi run -e ${{ matrix.environment }} tests -n 3
 
       - name: Upload coverage reports to Codecov
-        uses: codecov/codecov-action@v5.4.3
+        uses: codecov/codecov-action@v5.5.0
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           slug: scikit-learn-contrib/imbalanced-learn