Bump actions/checkout from 3 to 4 (#269)

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>

.github/workflows/rubocop.yml

@@ -51,7 +51,7 @@ jobs:
           echo "TMPDIR=$env:RUNNER_TEMP" >> $GITHUB_ENV
           git config --system core.autocrlf false
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: set up Ruby
         uses: ruby/setup-ruby@v1
         with:
@@ -95,7 +95,7 @@ jobs:
           - { rubocop: "v1.35.0", ruby: "3.2", os: ubuntu }
     steps:
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: set up Ruby
         uses: ruby/setup-ruby@v1
         with:
@@ -128,7 +128,7 @@ jobs:
         rubocop: [master]
     steps:
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: set up Ruby
         uses: ruby/setup-ruby@v1
         with:

.github/workflows/spell_checking.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         python-version: [3.8]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:
@@ -30,7 +30,7 @@ jobs:
     name: Check spelling of all files in commit with misspell
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install
         run: wget -O - -q https://raw.githubusercontent.com/client9/misspell/master/install-misspell.sh | sh -s -- -b .
       - name: Misspell