Update i3 to version 4.10.3.

Release notes:
Bugfixes:

* serialize con_id with %p in run_binding() (For FreeBSD)
* ignore InputHint when not in WM_HINTS (fixes e.g. mupdf focus)
* disable physically disconnect RandR outputs
* initialize workspace rect to the output's upon creation
* userguide: quoted strings need to be used, escaping isn窶冲 possible
* mkdirp: do not throw an error if directory exists (fixes layout loss for
  in-place restarts)
* i3bar: fix freeing static strings

(nros)