Update dotnet.yml

Author: lemire

.github/workflows/dotnet.yml

@@ -14,7 +14,7 @@ jobs:
     - uses: actions/checkout@v4
 
     - name: Setup .NET 8.0
-      uses: actions/setup-dotnet@v3
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: '8.0.x'
     - name: Restore dependencies