v2.10.8

• [Maintenance] Document that a transaction timeout also raises :fenced, indistinguishable from a takeover, and when removing :fenced from non_reloadable_errors is safe.
• [Fix] Stop Producer#close from raising Errno::EPIPE on JRuby when its close signal races the poller closing the pipe.
• [Fix] Abort a failed transaction only once: raise an abortable commit error as is instead of a follow-up Operation not valid in state Ready error, and do not abort after a failed begin_transaction.