Replace X509Certificate2 ctor with X509CertificateLoader.LoadCertificate (#9368)

Author: rchauhan18

src/Microsoft.DotNet.Wpf/src/WindowsBase/MS/Internal/IO/Packaging/Certificate.cs

@@ -113,7 +113,7 @@ internal X509Certificate2 GetCertificate()
                         // X509Certificate constructor desires a byte array
                         Byte[] byteArray = new Byte[s.Length];
                         PackagingUtilities.ReliableRead(s, byteArray, 0, (int)s.Length);
-                        _certificate = new X509Certificate2(byteArray);
+                        _certificate = X509CertificateLoader.LoadCertificate(byteArray);
                     }
                 }
             }