Bump actions/checkout from 3 to 4 (#229)

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/check_changelog.yml

@@ -15,7 +15,7 @@ jobs:
       !contains(github.event.pull_request.labels.*.name, 'dependencies')
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Check that CHANGELOG is touched
         run: |
           git fetch origin ${{ github.base_ref }} --depth 1 && \

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
       # Default stack for all Heroku apps created by Hatchet
       DEFAULT_APP_STACK: ${{ matrix.stack }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Ruby and dependencies
         uses: ruby/setup-ruby@v1
         with:
@@ -51,7 +51,7 @@ jobs:
       # source. I ported this as-is from the Travis config. Given we're trying to get rid of testrunner entirely,
       # it will stay like this. If we, for some reason, decide to keep testrunner, we should look into a fixed STACK env var.
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-java@v3
         with:
           distribution: zulu

.github/workflows/hatchet_app_cleaner.yml

@@ -19,7 +19,7 @@ jobs:
       HEROKU_DISABLE_AUTOUPDATE: 1
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Install Ruby and dependencies
         uses: ruby/setup-ruby@v1
         with: