fix(pkg): bump compat.libmysqlclient sha (strlcat/strlcpy on Linux)

Linux toolchain glibc >= 2.38 declares strlcat/strlcpy; vendored config now
defines HAVE_STRLCAT/HAVE_STRLCPY there so crypt_genhash_impl.cc uses libc
instead of its static fallback. Tag 8.4.6 updated again.

Author: wellwei

pkgs/c/compat.libmysqlclient.lua

@@ -12,13 +12,13 @@ package = {
         linux = {
             ["8.4.6"] = {
                 url = "https://github.com/wellwei/libmysqlclient/archive/refs/tags/8.4.6.tar.gz",
-                sha256 = "ceff60c7b41d9f1e75708e6173f403557211788d1aadcc54dce9a39105269fa4",
+                sha256 = "27decd6716591d84a6f765a3d63fcd24031373841c684369445b83a840b38bea",
             },
         },
         macosx = {
             ["8.4.6"] = {
                 url = "https://github.com/wellwei/libmysqlclient/archive/refs/tags/8.4.6.tar.gz",
-                sha256 = "ceff60c7b41d9f1e75708e6173f403557211788d1aadcc54dce9a39105269fa4",
+                sha256 = "27decd6716591d84a6f765a3d63fcd24031373841c684369445b83a840b38bea",
             },
         },
     },