www/librewolf: Update 156.0-1 => 157.0-1

Release Notes:
https://www.mozilla.org/en-US/firefox/156.0.1/releasenotes/
https://www.mozilla.org/en-US/firefox/157.0/releasenotes/

Changelogs:
https://librewolf.dev/librewolf/bsys6/releases/tag/156.0.1-1
https://librewolf.dev/librewolf/bsys6/releases/tag/157.0-1

PR: 299107
Sponsored by: UNIS Labs (vvd)
Co-authored-by: Vladimir Druzenko <vvd@FreeBSD.org>
MFH: 2026Q4