THRIFT-5479 Add net 6 support
diff --git a/lib/netstd/Benchmarks/Thrift.Benchmarks/Thrift.Benchmarks.csproj b/lib/netstd/Benchmarks/Thrift.Benchmarks/Thrift.Benchmarks.csproj
index 633850e..0e29b3b 100644
--- a/lib/netstd/Benchmarks/Thrift.Benchmarks/Thrift.Benchmarks.csproj
+++ b/lib/netstd/Benchmarks/Thrift.Benchmarks/Thrift.Benchmarks.csproj
@@ -23,6 +23,7 @@
     <TargetFramework>net6.0</TargetFramework>
     <TieredCompilation>false</TieredCompilation>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>