vendor/libedit: upgrade from 2019-12-31 to 2022-10-30

vendor/libedit: upgrade from 2019-12-31 to 2022-10-30

Most significant changes:

 - Fix filename autocompletion for strings like a\)b
 - Correct declaration of hook functions.
 - Add support for rl_delete_text and rl_set_key
 - Improve readline compatibility by adding rl_readline_state support.
 - fix memory issues found by fuzzing (double frees and buffer overflows)

See full change log in: https://www.thrysoee.dk/editline/