third_party: update libcurl from 7.83.0 to 7.84.0

Changelog: https://curl.se/changes.html#7_84_0

New release contains fixes for 4 security problems [1].

Patch adds a new option defined in curl build infrastructure with it's
default value used in 7.84.0. NOTE: PSL is a Public Suffix List (PSL),
it is a list of suffixes used for cookies.

1. https://curl.se/docs/releases.html

NO_DOC=libcurl submodule bump
NO_TEST=libcurl submodule bump