Misc solution-level files updates.

Author: sharpjs

.gitattributes

@@ -15,5 +15,5 @@
 # Auto detect text files and perform LF normalization
 * text=auto
 
-# Visual Studio diff
+# Show C# method names in diff chunk headers
 *.cs diff=csharp

.root.targets

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.Build.NoTargets/3.3.0">
+<Project Sdk="Microsoft.Build.NoTargets/3.5.0">
   <!-- https://github.com/microsoft/MSBuildSdks/tree/master/src/NoTargets -->
 
   <!--
@@ -22,12 +22,8 @@
     <EnableDefaultItems>false</EnableDefaultItems>
     <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
     <AppendRuntimeIdentifierToOutputPath>false</AppendRuntimeIdentifierToOutputPath>
-    <SkipCopyBuildProduct>true</SkipCopyBuildProduct>
-    <DebugSymbols>false</DebugSymbols>
-    <DebugType>none</DebugType>
     <IsPublishable>false</IsPublishable>
     <IsPackable>false</IsPackable>
-    <SetGitHubActionsVersion>true</SetGitHubActionsVersion>
   </PropertyGroup>
 
   <ItemGroup>

Directory.Build.props

@@ -42,8 +42,8 @@
   <!-- Build properties -->
   <PropertyGroup>
     <LangVersion>10</LangVersion>
-    <Nullable>enable</Nullable>
     <ImplicitUsings>true</ImplicitUsings>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <!-- Packaging properties -->

Directory.Build.targets

@@ -31,8 +31,8 @@
 
   <!-- Visibility -->
   <ItemGroup>
-    <InternalsVisibleTo Include="Prequel.Tests"/>
-    <InternalsVisibleTo Include="DynamicProxyGenAssembly2"/>
+    <InternalsVisibleTo Include="Prequel.Tests" />
+    <InternalsVisibleTo Include="DynamicProxyGenAssembly2" />
     <!-- Required for Moq to mock a class with an internal abstract method. -->
   </ItemGroup>
   <ItemGroup>
@@ -49,7 +49,7 @@
     <PackageReference Include="SauceControl.InheritDoc" Version="1.3.0" PrivateAssets="all" />
   </ItemGroup>
 
-  <!-- SourceLink https://github.com/dotnet/sourcelink/blob/master/README.md -->
+  <!-- SourceLink https://github.com/dotnet/sourcelink/blob/main/README.md -->
   <ItemGroup Condition="'$(IsPackable)' == 'true'">
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="all" />
   </ItemGroup>