mail/fetchmail: update to 6.5.7

Adds Italian translation, which was revived by Luca Vercelli (thanks!)

Changelog:	https://gitlab.com/fetchmail/fetchmail/-/releases#fetchmail-657-released-2025-10-18-32215-loc
PR:		290347
MFH:		2025Q4
Approved by:	Corey Halpin (maintainer)