vala: upgrade 0.56.15 -> 0.56.16

vala: upgrade 0.56.15 -> 0.56.16

0001-gtk4-Preserve-compatibility-with-4.14.patch
removed since it's included in 0.56.16

Changelog:
============
* Various improvements and bug fixes:
 - girparser: Recognize usage of time_t and don't rely on given GIR type
 - girparser: Recognize usage of off_t and don't rely on given GIR type
* Bindings:
 - gio-2.0: Restore ApplicationCommandLine.print*_literal() to not require 2.80
 - gmodule-2.0: Do not mark `Module.open` as deprecated
 - gtk4: Preserve compatibility with < 4.14 [#1531]
 - Regenerate for GIR-based bindings to pick up time_t fix (long vs time_t)

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>