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/test.yml

@@ -30,7 +30,7 @@ jobs:
         python-version: ["3.9", "3.10"]
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         path: freud-examples
     # Important! All steps that use the conda environment should define "shell: bash -l {0}".
@@ -51,7 +51,7 @@ jobs:
         # Install testing requirements
         mamba install pytest nbval
     # Build freud from source to test the examples on the latest version
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         path: freud
         repository: glotzerlab/freud