Downgrade to a stable version

Author: MaggieKimani1

src/Microsoft.OpenApi.Readers/Microsoft.OpenApi.Readers.csproj

@@ -36,7 +36,7 @@
 
     <ItemGroup>
         <PackageReference Include="SharpYaml" Version="2.1.0" />
-        <PackageReference Include="System.Text.Json" Version="8.0.0-preview.2.23128.3" />
+        <PackageReference Include="System.Text.Json" Version="7.0.2" />
     </ItemGroup>
 
     <ItemGroup>