[ruby/openssl] digest: remove optional parameter from OpenSSL::Digest#finish

OpenSSL::Digest#finish overrides Digest::Instance#finish and is called
from the Digest::Class framework in the digest library. This method is
not supposed to take any arguments, as suggested by the RDoc comment for
Digest::Instance#finish.

It is a private method and not exposed to users. Let's remove it.

This optional parameter exists since r15602 in Ruby trunk, the commit
which converted OpenSSL::Digest to a subclass of Digest::Class.

https://github.com/ruby/openssl/commit/dcb2a4f30b

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