Update Microsoft.Net.Compilers.Toolset to 3.10.0

Author: AArnott

src/Directory.Build.props

@@ -24,7 +24,7 @@
     <LibGit2SharpNativeVersion>2.0.312</LibGit2SharpNativeVersion>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.Net.Compilers.Toolset" Version="3.8.0-5.final" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.Net.Compilers.Toolset" Version="3.10.0" PrivateAssets="all" />
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" PrivateAssets="All" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
   </ItemGroup>