[ruby/openssl] pkey/ec: remove OpenSSL::PKey::EC::Group.new(ec_method) form

The form created an empty EC_GROUP object with the specified EC_METHOD.
However, the feature was unfinished and not useful in any way because
OpenSSL::PKey::EC::Group did not implement wrappers for necessary
functions to set actual parameters for the group, namely
EC_GROUP_set_curve() family.

EC_GROUP object creation with EC_METHOD explicitly specified is
deprecated in OpenSSL 3.0, as it was apparently not intended for use
outside OpenSSL.

It is still possible to create EC_GROUP, but without EC_METHOD
explicitly specified - OpenSSL chooses the appropriate EC_METHOD for
the curve type. The OpenSSL::PKey::EC::Group.new(<:GFp|:GF2m>, p, a, b)
form will continue to work.

https://github.com/ruby/openssl/commit/df4bec841f

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