mysql84: 8.4.8 -> 8.4.9

https://dev.mysql.com/doc/relnotes/mysql/8.4/en/news-8-4-9.html

Fixes CVE-2026-34270
Fixes CVE-2026-34271
Fixes CVE-2026-34276
Fixes CVE-2026-34308
Fixes CVE-2026-22009
Fixes CVE-2026-22017
Fixes CVE-2026-34303
Fixes CVE-2025-14017
Fixes CVE-2026-34318
Fixes CVE-2026-34317
Fixes CVE-2025-14017
Fixes CVE-2026-34318
Fixes CVE-2026-34317
Fixes CVE-2026-34319
Fixes CVE-2026-22004
Fixes CVE-2026-34304
Fixes CVE-2026-35236
Fixes CVE-2026-35237
Fixes CVE-2026-35238
Fixes CVE-2026-35239
Fixes CVE-2026-21998
Fixes CVE-2026-22005
Fixes CVE-2026-22002
Fixes CVE-2026-35240
Fixes CVE-2026-22015
Fixes CVE-2026-22001

https://www.oracle.com/security-alerts/cpuapr2026.html#AppendixMSQL

pkgs/by-name/my/mysql84/package.nix

@@ -27,11 +27,11 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "mysql";
-  version = "8.4.8";
+  version = "8.4.9";
 
   src = fetchurl {
     url = "https://dev.mysql.com/get/Downloads/MySQL-${lib.versions.majorMinor finalAttrs.version}/mysql-${finalAttrs.version}.tar.gz";
-    hash = "sha256-vp2Wzfh/J2lSos3ZYPEGuWCohg5GwRXtOcG18uA4eiA=";
+    hash = "sha256-5KqLOeQtH+B48zu9c2lfrCtU28e7E38L2+Y/e+GgLWs=";
   };
 
   nativeBuildInputs = [