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] <[email protected]>

.github/workflows/kube-linter-sample.yml

@@ -11,7 +11,7 @@ jobs:
   scan:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       # This prepares directory where github/codeql-action/upload-sarif@v1 looks up report files by default.
       - name: Create ../results directory for SARIF report files

.github/workflows/self-test.yml

@@ -18,7 +18,7 @@ jobs:
         version: [ latest, 0.2.3 ]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Scan 1 - should succeed
         uses: ./
@@ -47,7 +47,7 @@ jobs:
   test-with-sarif-upload:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       # Setup directory where github/codeql-action/upload-sarif@v1 looks up files by default.
       - name: Create ../results directory for sarif files

.github/workflows/versioning.yml

@@ -9,7 +9,7 @@ jobs:
   update-semver:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: haya14busa/action-update-semver@v1
         with:
           major_version_tag_only: true