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] <support@github.com>

.github/workflows/pre-commit.yml

@@ -10,6 +10,6 @@ jobs:
   pre-commit:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v4
     - uses: pre-commit/action@v3.0.0

.github/workflows/python-tests.yml

@@ -25,7 +25,7 @@ jobs:
         shell: bash -l {0}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     # We initiate the environment empty, and check if a key for this environment doesn't already exist in the cache
     - name: Initiate empty environment