Bump actions/checkout from 2.3.5 to 2.4.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.3.5 to 2.4.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.3.5...v2.4.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/codeql-analysis.yml

@@ -21,7 +21,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2.3.5
+      uses: actions/checkout@v2.4.0
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/maven.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Verify Source Format
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - name: Setup Java
         uses: actions/setup-java@v2
         with:
@@ -30,7 +30,7 @@ jobs:
         # test against latest update of each major Java version, as well as specific updates of LTS versions:
         java: [ 8.0.x, 9.0.x, 10.0.x, 11.0.x, 12.0.x, 16.0.x ]
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - name: Setup Java
         uses: actions/setup-java@v2
         with:
@@ -50,7 +50,7 @@ jobs:
     runs-on: ubuntu-latest
     name: GraalVM Maven Test
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - uses: DeLaGuardo/setup-graalvm@48f2bf339ab7d35e31029b1822a213681fdfc42e
         with:
           graalvm-version: '19.3.0.java8'
@@ -60,7 +60,7 @@ jobs:
     runs-on: ubuntu-latest
     name: End-to-End Test Against Real Cluster
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - name: Create k8s Kind Cluster
         uses: helm/[email protected]
       - name: Run E2E with Maven
@@ -77,7 +77,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Examples smoke test
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - name: Setup Java
         uses: actions/setup-java@v2
         with:
@@ -128,7 +128,7 @@ jobs:
           - 5000:5000
     name: CRD Java Models Code Generation
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - name: Publish to Registry
         uses: elgohr/Publish-Docker-Github-Action@master
         with: