Bump actions/checkout from 3 to 4 (#47)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

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

.github/workflows/codeql-analysis.yml

@@ -39,7 +39,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/dotnet.yml

@@ -8,7 +8,7 @@ jobs:
   build:
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Setup .NET
       uses: actions/setup-dotnet@v3
       with:
@@ -26,7 +26,7 @@ jobs:
     needs: build
     if: ${{ github.event_name == 'push' }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: publish on version change
       id: publish_nuget
       uses: rohith/publish-nuget@v2
@@ -39,7 +39,7 @@ jobs:
     if: ${{ github.event_name == 'push' }}
     needs: build
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: mattnotmitt/doxygen-action@v1
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3