www/ruby-ethon: update to 0.14.0

Quote from commit logs:

0.14.0 (2021-04-26)

* Fix typo in YARD doc
* Fix broken master build
* Remove ssl_cacert from return codes

0.13.0 (2021-04-12)

* Added :dns_shuffle_addresses curl option
* Added easy option :path_as_is
* Add WEBrick dependency for Ruby 3.0+.
* Fix keyword parameters for Ruby 2.7+.
* Easy::Operations#handle: Thread-safe cleanup (#136)
* add pinnedpublickey option
* Avoid mutating strings to support --enable-frozen-string-literal.
* Use the proper varargs definition of libcurl functions (#183)
* Add support for HTTPS proxies
* Fix "multi" in examples referring to itself as "easy"

(taca)