revert STJ

Author: EgorBo

src/libraries/System.Text.Json/src/System.Text.Json.csproj

@@ -9,7 +9,6 @@
     <IncludeInternalObsoleteAttribute>true</IncludeInternalObsoleteAttribute>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
     <IsPackable>true</IsPackable>
-     <EnableUnsafeV2MigrationAnalyzer>true</EnableUnsafeV2MigrationAnalyzer>
     <PackageDescription>Provides high-performance and low-allocating types that serialize objects to JavaScript Object Notation (JSON) text and deserialize JSON text to objects, with UTF-8 support built-in. Also provides types to read and write JSON text encoded as UTF-8, and to create an in-memory document object model (DOM), that is read-only, for random access of the JSON elements within a structured view of the data.
 
 The System.Text.Json library is built-in as part of the shared framework in .NET Runtime. The package can be installed when you need to use it in other target frameworks.</PackageDescription>