Fix warnings when loading net/protocol #123
Merged
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As described in https://www.ruby-lang.org/en/news/2020/12/25/ruby-3-0-0-released/, Ruby 3.0.0 promoted net-http and net-imap from stdlib. Adding net-http as a dependency avoids "already initialized constant errors" if net-imap and faraday are used. See ruby/net-imap#16 (comment) for
more details.