AUTHORS: refresh with recent new contributors

"I don't know half of you half as well as I should like; and I like less
than half of you half as well as you deserve."

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #16563