CLSA-2026-1791426968 vim: Fix of 3 CVEs

CVE-2026-73072: fix heap buffer overflow in setsofo with a crafted spell file upstream 9.2.0846 - CVE-2026-73076: fix arbitrary command execution via a crafted .VimballRecord vimball member upstream 9.2.0847 - CVE-2026-73078: fix Ex command injection via crafted netrw bookmark/history menu...