Fix missing new

Co-authored-by: Edward Neal <55035479+edwardneal@users.noreply.github.com>

Author: benrr101

src/Microsoft.Data.SqlClient/tests/tools/Microsoft.Data.SqlClient.TestUtilities/Fixtures/CertificateFixtureBase.cs

@@ -97,7 +97,7 @@ protected X509Certificate2 CreateCertificate(string subjectName, IEnumerable<str
                         PreserveKeyName = true
                     });
                 #else
-                return X509Certificate2(
+                return new X509Certificate2(
                     ephemeral.Export(X509ContentType.Pkcs12, password),
                     password,
                     X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.Exportable);