vim: Fix of CVE-2026-42307

CVE-2026-42307: fix OS command injection in netrw plugin via crafted sftp:// URLs by hardening the tempfile suffix regex and escaping the tempfile argument before passing it to the sftp command...

CLSA-2026-1779212372 vim: Fix of CVE-2026-42307

CVE-2026-42307: fix OS command injection in netrw plugin via crafted sftp:// URLs by hardening the tempfile suffix regex and escaping the tempfile argument before passing it to the sftp command...