Bump actions/checkout from 3 to 4 (#134)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/cffconvert.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out a copy of the repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Check whether the citation metadata from CITATION.cff is valid
         uses: citation-file-format/[email protected]

.github/workflows/python_build.yml

@@ -31,7 +31,7 @@ jobs:
     - name: Update pip and wheel
       run: python -m pip install --upgrade pip wheel
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Build sdist
       run: python setup.py sdist
     - name: Install sdist
@@ -43,7 +43,7 @@ jobs:
     - name: Remove sdist install
       run: pip uninstall -y pyprep
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Build wheel
       run: python setup.py bdist_wheel
     - name: Install wheel

.github/workflows/python_publish.yml

@@ -16,7 +16,7 @@ jobs:
       TZ: Europe/Berlin
       FORCE_COLOR: true
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python
       uses: actions/setup-python@v4
       with:

.github/workflows/python_tests.yml

@@ -33,7 +33,7 @@ jobs:
       TZ: Europe/Berlin
       FORCE_COLOR: true
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4