CLSA-2026-1792659934 rsync: Fix of CVE-2026-53783

CVE-2026-53783: fix a TOCTOU escape from rrsync's restricted directory by replacing the lexical-only Perl support/rrsync with upstream's Python one, which pins each validated path component through /proc/self/fd, fails closed on path anomalies, pins the receiver option directories a peer can...