package/expat: security bump version to 2.6.3

Changelog:
https://github.com/libexpat/libexpat/blob/R_2_6_3/expat/Changes

Fixes CVE-2024-45490, CVE-2024-45491 & CVE-2024-45492.

Follow upstream switch of project repository to github:
https://sourceforge.net/p/expat/news/2022/01/project-moved-to-github/

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
3 files changed