Bump actions/checkout from 3 to 4 (#47)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mr. Bubbles <manni@zapto.de>

.github/workflows/mypy.yaml

@@ -9,7 +9,7 @@ jobs:
   mypy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4.1.1
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}

.github/workflows/ruff.yml

@@ -6,5 +6,5 @@ jobs:
   ruff:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: chartboost/ruff-action@v1

.github/workflows/test.yaml

@@ -24,7 +24,7 @@ jobs:
           echo "Current permission level is ${{ steps.checkAccess.outputs.user-permission }}"
           echo "Job originally triggered by ${{ github.actor }}"
           exit 1
-      - uses: actions/checkout@v4.1.1
+      - uses: actions/checkout@v4
         with:
             ref: ${{ github.event.pull_request.head.sha }}
       - uses: actions/setup-python@v5