expat: update to 2.8.2

This version bump includes fixes for the following CVEs:
- CVE-2026-50219
- CVE-2026-56131
- CVE-2026-56132
- CVE-2026-56403
- CVE-2026-56404
- CVE-2026-56405
- CVE-2026-56406
- CVE-2026-56407
- CVE-2026-56408
- CVE-2026-56409
- CVE-2026-56410
- CVE-2026-56411
- CVE-2026-56412

Full release notes:
https://github.com/libexpat/libexpat/blob/R_2_8_2/expat/Changes

Signed-off-by: Wei-Ting Yang <williamatcg@gmail.com>
(cherry picked from commit 62bff8c182)

libs/expat/Makefile

@@ -6,12 +6,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=expat
-PKG_VERSION:=2.8.1
+PKG_VERSION:=2.8.2
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/libexpat/libexpat/releases/download/R_$(subst .,_,$(PKG_VERSION))
-PKG_HASH:=a52eb72108be160e190b5cafa5bba8663f1313f2013e26060d1c18e26e31067b
+PKG_HASH:=ef7d1994f533c9e7343d6c19f31064fc8ebbcbcaa144be3812b4f43052a05f4c
 
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=COPYING