Bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...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>

.github/workflows/hadolint.yml

@@ -15,7 +15,7 @@ jobs:
     name: Run hadolint against docker files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Pull hadolint/hadolint:latest Image
         run: docker pull hadolint/hadolint:latest
       - name: Run hadolint against Dockerfiles

.github/workflows/markdownlint.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Pull markdownlint/markdownlint:latest Image
         run: docker pull markdownlint/markdownlint:latest
       - name: Run markdownlint against *.md files

.github/workflows/shellcheck.yml

@@ -13,7 +13,7 @@ jobs:
     name: Run shellcheck against shell scripts
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Pull koalaman/shellcheck:stable Image
         run: docker pull koalaman/shellcheck:stable
       - name: Run Shellcheck against shell scripts

.github/workflows/yamllint.yml

@@ -15,7 +15,7 @@ jobs:
     name: Run yamllint against YAML files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: yaml-lint
         uses: ibiqlik/action-yamllint@v3
         with: