devel/wasmer: update to 4.2.8

[uzsolt]

Summary

Changelog: https://github.com/wasmerio/wasmer/blob/main/CHANGELOG.md

PR: 278091
Approved by: Submitter is maintainer, bofh (mentor) OR diizzy (mentor)
(Differential Revision: https://reviews.freebsd.org/D###)

Test Plan

Poudriere builds on 13.2, 13.3, 14.0 (amd64).

Portlint, portfmt, portclippy passed.

I don't forget git commit --author.

[diizzy]

LGTM, keep up the good work!