Bump actions/checkout from 3 to 4 (#214)

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)

.github/workflows/makefile-test.yaml

@@ -14,7 +14,7 @@ jobs:
         python-version: [ '3.8', '3.9', '3.10' ]
     name: Python ${{ matrix.python-version }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v4
         with:

.github/workflows/publish.yaml

@@ -12,7 +12,7 @@ jobs:
     runs-on: macos-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install mdbook
         run: brew install mdbook

.github/workflows/release-pypi.yaml

@@ -15,7 +15,7 @@ jobs:
       id-token: write
       contents: write
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install dependencies
         run: python3 -m pip install --upgrade pip build setuptools wheel twine
       - name: Build pip package

.github/workflows/release.yaml

@@ -16,7 +16,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Get version
         run: |
           # The environment variable GITHUB_REF is refs/tags/starterkit-*

.github/workflows/summarize-test.yaml

@@ -15,7 +15,7 @@ jobs:
     name: Python ${{ matrix.python-version }}
     steps:
       - name: Check out repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v4
         with: