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]>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Poetry
         uses: snok/[email protected]
       - name: Build

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
   tox_test:
     name: Tox tests
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Run Tox tests
       id: test
       uses: fedora-python/tox-github-action@main
@@ -38,6 +38,6 @@ jobs:
     name: Pre-commit
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
       - uses: pre-commit/[email protected]