tools/expat: update to 2.8.2
This version bump includes fixes for the following CVEs:
- CVE-2026-41080
- CVE-2026-45186
- 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/master/expat/Changes
Signed-off-by: Wei-Ting Yang <williamatcg@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/24016
Signed-off-by: Robert Marko <robimarko@gmail.com>