Remove inheritance of TimeoutError from ETIMEDOUT

This should be its own error class, it does not come from an ETIMEDOUT,
and inheriting from that makes this class hard to differentiate.

Co-authored-by: Daniel Colson <composerinteralia@github.com>

contrib/ruby/lib/trilogy/error.rb

@@ -66,13 +66,7 @@ class QueryError < ClientError
   class CastError < ClientError
   end
 
-  class TimeoutError < Errno::ETIMEDOUT
-    include ConnectionError
-
-    def initialize(error_message = nil, error_code = nil)
-      super
-      @error_code = error_code
-    end
+  class TimeoutError < BaseConnectionError
   end
 
   # DatabaseError was replaced by ProtocolError, but we'll keep it around as an