Bump actions/checkout from 3 to 4

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] <[email protected]>

.github/workflows/dockerfile-validator.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Verify Dockerfile
       uses: ghe-actions/dockerfile-validator@v1
       with:

.github/workflows/integration-tests.yml

@@ -17,7 +17,7 @@ jobs:
           - 1883:1883
     steps:
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Set up Go
       uses: actions/setup-go@v5
       with:

.github/workflows/linting.yml

@@ -11,7 +11,7 @@ jobs:
     name: linting
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: golangci-lint
       uses: golangci/golangci-lint-action@v6
       with:

.github/workflows/tests.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Set up Go
       uses: actions/setup-go@v5
       with: