upgrade net6.0 which is LTS version.

Author: isdaniel

.github/workflows/dotnet.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 5.0.x
+        dotnet-version: 6.0.x
     - name: Restore dependencies
       run: dotnet restore
     - name: Build

tests/MiniWordTests/MiniWordTests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-	<TargetFrameworks>net5.0;</TargetFrameworks>
+	<TargetFrameworks>net6.0;</TargetFrameworks>
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>