CLSA-2026-1774344754 vim: Fix of 2 CVEs

CVE-2026-28417: fix OS command injection in netrw plugin via crafted scp:// URIs by adding strict RFC1123 hostname validation and using shellescape for hostname and port values. - CVE-2026-28421: fix heap-buffer-overflow and SEGV in swap file recovery by adding bounds checks on pepagecount,...