Bump actions/checkout from 2.3.5 to 2.4.0 (#1304)

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](https://github.com/actions/checkout/compare/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>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repo
-      uses: actions/checkout@v2.3.5
+      uses: actions/checkout@v2.4.0
       with:
         fetch-depth: 0
     - name: Set up Go
@@ -137,7 +137,7 @@ jobs:
       POWERDNS_SERVERNAME: ${{ secrets.POWERDNS_SERVERNAME }}
     steps:
     - name: Checkout repo
-      uses: actions/checkout@v2.3.5
+      uses: actions/checkout@v2.4.0
       with:
         fetch-depth: 0
     - name: Set up Go

.github/workflows/codeql-analysis.yml

@@ -36,7 +36,7 @@ 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/release.yml

@@ -16,7 +16,7 @@ jobs:
         GITHUB_TOKEN: ${{ github.token }}
 
     - name: Checkout repo
-      uses: actions/checkout@v2.3.5
+      uses: actions/checkout@v2.4.0
       with:
         fetch-depth: 0