Update System.Text.Json dependency (#791)

* Update System.Text.Json dependency

* Update System.Text.Json dependency condition

Author: WeihanLi

src/KubernetesClient/KubernetesClient.csproj

@@ -47,7 +47,7 @@
     <PackageReference Include="IdentityModel.OidcClient" Version="4.0.0" />
 
     <PackageReference Include="Portable.BouncyCastle" Version="1.8.10" Condition="'$(TargetFramework)' == 'netstandard2.1'" />
-    <PackageReference Include="System.Text.Json" Version="6.0.0" Coondition="'$(TargetFramework)' == 'netstandard2.1'" />
+    <PackageReference Include="System.Text.Json" Version="6.0.0" Condition="'$(TargetFramework)' == 'netstandard2.1' OR '$(TargetFramework)' == 'net5'" />
 
   </ItemGroup>