(#85) CI: update .NET version

Author: ForNeVeR

.github/workflows/main.yml

@@ -17,17 +17,17 @@ jobs:
       matrix:
         image: [macos-12, ubuntu-22.04, windows-2022]
     env:
-      DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
+      DOTNET_NOLOGO: 1
       DOTNET_CLI_TELEMETRY_OPTOUT: 1
       NUGET_PACKAGES: ${{ github.workspace }}/.github/nuget-packages
     steps:
       - uses: actions/checkout@v2
 
       # Backend
-      - name: Setup .NET Core SDK
-        uses: actions/setup-dotnet@v1
+      - name: Set up .NET SDK
+        uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: '3.1.x'
+          dotnet-version: '8.0.x'
       - name: NuGet Cache
         uses: actions/cache@v2
         with: