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] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -13,7 +13,7 @@ jobs:
           - 5000:5000
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.3.5
+      uses: actions/checkout@v2.4.0
 
     - name: Set up QEMU
       uses: docker/setup-qemu-action@v1.1.0

.github/workflows/kernel-ci.yaml

@@ -14,7 +14,7 @@ jobs:
           - 5000:5000
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.3.5
+      uses: actions/checkout@v2.4.0
 
     - name: Use docker buildx
       run: docker buildx create --use

.github/workflows/kernel-push.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: self-hosted
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.3.5
+      uses: actions/checkout@v2.4.0
 
     - name: Login to quay.io
       if: ${{ github.actor != 'dependabot[bot]' }}

.github/workflows/push.yaml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.3.5
+      uses: actions/checkout@v2.4.0
 
     - name: Set up QEMU
       uses: docker/setup-qemu-action@v1.1.0