remove duplicate PS384 and PS512, and add missing ES384 and ES512 (#379)

Author: LeivyMendoza

src/OidcClient/Policy.cs

@@ -67,8 +67,8 @@ public class Policy
             OidcConstants.Algorithms.Asymmetric.PS512,
 
             OidcConstants.Algorithms.Asymmetric.ES256,
-            OidcConstants.Algorithms.Asymmetric.PS384,
-            OidcConstants.Algorithms.Asymmetric.PS512
+            OidcConstants.Algorithms.Asymmetric.ES384,
+            OidcConstants.Algorithms.Asymmetric.ES512
         };
     }
 }