CLSA-2025-1756928197 Fix CVE(s): CVE-2025-26603

SECURITY UPDATE: fix use-after-free vulnerability in buffer closing - debian/patches/CVE-2025-26603.patch: Fix heap use-after-free in strtoreg - CVE-2025-26603...

heap-use-after-free in function str_to_reg in vim/vim

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