chore(deps): bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

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

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
                 python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
         steps:
             - name: "Check out repository"
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: "Set up Python and development dependencies"
               uses: ./.github/actions/setup
@@ -35,7 +35,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: "Check out repository"
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: "Set up Python and development dependencies"
               uses: ./.github/actions/setup
@@ -49,7 +49,7 @@ jobs:
         needs: [test, check]
         steps:
             - name: "Check out repository"
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: "Set up Python and development dependencies"
               uses: ./.github/actions/setup