Update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/publish.yml

@@ -17,7 +17,7 @@ jobs:
          dotnet: ['6.x']
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Release Dll
       run : dotnet build ./SourceLink.Environment/SourceLink.Environment.csproj -c Release