Update actions/setup-dotnet action to v4

Author: renovate[bot]

.github/workflows/main.yml

@@ -44,7 +44,7 @@ jobs:
           key: ${{ runner.os }}.nuget.${{ hashFiles('**/*.*proj') }}
 
       - name: Set up .NET SDK
-        uses: actions/setup-dotnet@v3
+        uses: actions/setup-dotnet@v4
         with:
           dotnet-version: '8.0.x'