www/squid: Update 6.12 => 6.13

Changelog:
https://github.com/squid-cache/squid/releases/tag/SQUID_6_13



- Move MASTER_SITES to github - upstream stopped publishing archives
  anywhere except github.
- Improve local patches for build NIS support.
- Rename patch-src-cf.data.pre to patch-src_cf.data.pre and refresh.

PR:		285493
Approved by:	Pavel Timofeev <timp87@gmail.com> (maintainer)
Co-authored-by: Pavel Timofeev <timp87@gmail.com>
MFH:		2025Q2