f11a9b4 Upgrade to Ruby 3.0.0.

Authored and Committed by vondruch 3 years ago
    Upgrade to Ruby 3.0.0.
    
    * Extract RSS and REXML into separate subpackages, because they were moved from
      default gems to bundled gems.
    
    * Obsolete Net::Telnet and XMLRPC packages, because they were dropped from Ruby.
    
    The detailed changelog leading to this release is preserved in
    private-ruby-3.0 branch.
    
        
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