Better deal with MySQL's `max_execution_time` setting
The max_execution_time might cause rows to be missing from dumps when PHP < 7.4.13, but could also lead to dumps being aborted for newer PHP versions (#84).
This release disables the max_execution_time timeout value for slimdump's database connection (#86).
Additionally, a warning is printed (#85) when the number of rows dumped does not match the number expected (which is based on a COUNT(*) query).