Fix tests and tools

Author: John Luo

eng/tools/BaselineGenerator/BaselineGenerator.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>netcoreapp5.0</TargetFramework>
     <StartArguments>-s https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json</StartArguments>
     <StartWorkingDirectory>$(MSBuildThisFileDirectory)../../</StartWorkingDirectory>
   </PropertyGroup>

src/Hosting/IntegrationTesting/src/Common/Tfm.cs

@@ -13,6 +13,7 @@ public static class Tfm
         public const string NetCoreApp22 = "netcoreapp2.2";
         public const string NetCoreApp30 = "netcoreapp3.0";
         public const string NetCoreApp31 = "netcoreapp3.1";
+        public const string NetCoreApp50 = "netcoreapp5.0";
 
         public static bool Matches(string tfm1, string tfm2)
         {

src/Hosting/test/FunctionalTests/ShutdownTests.cs

@@ -55,7 +55,7 @@ private async Task ExecuteShutdownTest(string testName, string shutdownMechanic)
                     RuntimeFlavor.CoreClr,
                     RuntimeArchitecture.x64)
                 {
-                    TargetFramework = Tfm.NetCoreApp31,
+                    TargetFramework = Tfm.NetCoreApp50,
                     ApplicationType = ApplicationType.Portable,
                     PublishApplicationBeforeDeployment = true,
                     StatusMessagesEnabled = false

src/Localization/Localization/test/Microsoft.Extensions.Localization.RootNamespace.Tests/Microsoft.Extensions.Localization.RootNamespace.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp3.0;net472</TargetFrameworks>
+    <TargetFrameworks>$(DefaultNetCoreTargetFramework);net472</TargetFrameworks>
     <RootNamespace>LocalizationTest.Abc</RootNamespace>
   </PropertyGroup>
   <ItemGroup>