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/publish-nuget-packages.yaml

@@ -19,7 +19,7 @@ jobs:
       name: Build
 
       steps:
-        - uses: actions/checkout@v3
+        - uses: actions/checkout@v4
 
         - name: Build & test - User
           if: github.actor != 'dependabot[bot]'
@@ -63,7 +63,7 @@ jobs:
       needs: Build
       if: ${{ success() }}
       steps:
-        - uses: actions/checkout@v3        
+        - uses: actions/checkout@v4        
 
         - name: Publish NuGet package
           uses: ./.github/actions/publish-nuget
@@ -80,7 +80,7 @@ jobs:
       needs: Build
       if: ${{ success() && github.ref == 'refs/heads/main' }}
       steps:
-        - uses: actions/checkout@v3
+        - uses: actions/checkout@v4
 
         - name: Publish NuGet package
           uses: ./.github/actions/publish-nuget
@@ -97,7 +97,7 @@ jobs:
       needs: Build
       if: ${{ success() && github.ref == 'refs/heads/main' }}
       steps:
-        - uses: actions/checkout@v3
+        - uses: actions/checkout@v4
 
         - name: Publish NuGet package
           uses: ./.github/actions/publish-nuget

.github/workflows/trivy-repository-scan.yaml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Run Trivy vulnerability scanner in repo mode
         uses: aquasecurity/trivy-action@master