audio/re: Update 4.8.0 => 4.8.1

Changelog:
https://github.com/baresip/re/releases/tag/v4.8.1

PR: 295686
Approved by: Marek Zarychta <zarychtam@plan-b.pwste.edu.pl>
Security: GHSA-hvxv-v2gp-v93h
Security: https://github.com/baresip/baresip/issues/3705
Sponsored by: UNIS Labs
MFH: 2026Q2

(cherry picked from commit 46280db2874b52f8ab8b353c2561d8a51b5f9040)