fixes the failing build pipeline for tests

Author: manishT72x

.github/workflows/dotnet.yml

@@ -12,9 +12,9 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Setup .NET
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 3.1.x
+        dotnet-version: 6.0.x
     - name: Restore dependencies
       run: dotnet restore
     - name: Build

Xero.NetStandard.OAuth2.Test/Xero.NetStandard.OAuth2.Test.csproj

@@ -5,7 +5,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>Xero.NetStandard.OAuth2.Test</RootNamespace>
     <AssemblyName>Xero.NetStandard.OAuth2.Test</AssemblyName>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <IsPackable>false</IsPackable>
     <FileAlignment>512</FileAlignment>
   </PropertyGroup>