Remove secp256k1 from tests

Author: anakinj

test/openssl/test_pkey.rb

@@ -372,7 +372,7 @@ def test_s_from_parameters_ec_priv_given_as_integer
     end
 
     def test_s_from_parameters_ec_priv_and_pub_given_for_different_curves
-      ["prime256v1", "secp256k1", "secp384r1", "secp521r1"].each do |curve|
+      ["prime256v1", "secp384r1", "secp521r1"].each do |curve|
         source  = OpenSSL::PKey::EC.generate(curve)
         new_key = OpenSSL::PKey.from_parameters("EC", group: source.group.curve_name,
                                                       pub: source.public_key.to_bn.to_s(2),