Bump actions/checkout from 1 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 1 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v1...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>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
         ruby-version: ["2.6"]
     steps:
       - name: Checkout code
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
       - name: Build container
         run: docker build . --file Dockerfile --tag octocatalog-diff:ruby${{matrix.ruby-version}} --build-arg RUBY_VERSION=${{matrix.ruby-version}} --build-arg PUPPET_VERSION=${{env.PUPPET_VERSION}}
       - name: Tests
@@ -33,7 +33,7 @@ jobs:
         ruby-version: ["2.6"]
     steps:
       - name: Checkout code
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
       - name: Build container
         run: docker build . --file Dockerfile --tag octocatalog-diff:ruby${{matrix.ruby-version}} --build-arg RUBY_VERSION=${{matrix.ruby-version}} --build-arg PUPPET_VERSION=${{env.PUPPET_VERSION}}
       - name: Tests
@@ -52,7 +52,7 @@ jobs:
         ruby-version: ["2.6"]
     steps:
       - name: Checkout code
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
       - name: Build container
         run: docker build . --file Dockerfile --tag octocatalog-diff:ruby${{matrix.ruby-version}} --build-arg RUBY_VERSION=${{matrix.ruby-version}} --build-arg PUPPET_VERSION=${{env.PUPPET_VERSION}}
       - name: Tests
@@ -71,7 +71,7 @@ jobs:
         ruby-version: ["2.6"]
     steps:
       - name: Checkout code
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
       - name: Build container
         run: docker build . --file Dockerfile --tag octocatalog-diff:ruby${{matrix.ruby-version}} --build-arg RUBY_VERSION=${{matrix.ruby-version}} --build-arg PUPPET_VERSION=${{env.PUPPET_VERSION}}
       - name: Tests