sysutils/lnav: Update to 0.12.3-beta2-62

• Unbreak build with clang 19 (main) [1]
• Fix runtime crash on FreeBSD 14.1 [2]

[1] https://github.com/tstack/lnav/issues/1328
[2] https://github.com/tstack/lnav/issues/1318

ChangeLog:
https://github.com/tstack/lnav/compare/v0.12.2...v0.12.3-beta2-62-g1bef9f04

PR: 282407