dns/dnsmasq-devel: update to v2.91rc4
Upstream git log since v2.91rc3, changes by Simon Kelley:
- f9f8d19 2025-02-09 | Yet another 0x20 fix.
Upstream has one more fix in Git,
so this isn't going to be the release yet.
MFH: 2025Q1
(cherry picked from commit 884bdef652b25c2c6491989f89cc2b13263d1fcc)