gnutls: 3.8.11 -> 3.8.12

Fixes: CVE-2026-1584 CVE-2025-14831
https://lists.gnutls.org/pipermail/gnutls-help/2026-February/004914.html
(cherry picked from commit c38793f)

Author: vcunat

pkgs/development/libraries/gnutls/default.nix

@@ -59,11 +59,11 @@ in
 
 stdenv.mkDerivation rec {
   pname = "gnutls";
-  version = "3.8.11";
+  version = "3.8.12";
 
   src = fetchurl {
     url = "mirror://gnupg/gnutls/v${lib.versions.majorMinor version}/gnutls-${version}.tar.xz";
-    hash = "sha256-kb0jxKhuvGFS6BMD0gz2zq65e8j4QmbQ+uxuKfF7qiA=";
+    hash = "sha256-p7NBQhv9RZrPejdMpK87ngZgjc1715Kyv0cL6gErjlE=";
   };
 
   outputs = [