Bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/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)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/python-package.yml

@@ -17,7 +17,7 @@ jobs:
     env:
       MINIZINC_URL: https://github.com/MiniZinc/MiniZincIDE/releases/download/${{ matrix.minizinc-version }}/MiniZincIDE-${{ matrix.minizinc-version }}-x86_64.AppImage
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0
       - name: Add bin/ to PATH
@@ -58,7 +58,7 @@ jobs:
   lints:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Install uv
         uses: astral-sh/setup-uv@v6
       - name: Set up Python
@@ -77,7 +77,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Install uv
         uses: astral-sh/setup-uv@v6
       - name: Set up Python ${{ matrix.python-version }}