Update s2n-tls to v1.5.9 (#5904)

packages/s/s2n-tls/xmake.lua

@@ -6,6 +6,7 @@ package("s2n-tls")
     add_urls("https://github.com/aws/s2n-tls/archive/refs/tags/$(version).tar.gz",
              "https://github.com/aws/s2n-tls.git")
 
+    add_versions("v1.5.9", "8a9aa2ba9a25f936e241eaa6bb7e39bc1a097d178c4b255fa36795c0457e3f4e")
     add_versions("v1.5.7", "c30b97c8bcccc0557331dd1a043010a70984c9cff11b0bbd769651db68f8b91d")
     add_versions("v1.5.6", "85602d0ad672cb233052504624dec23b47fc6d324bb82bd6eaff13b8f652dec3")
     add_versions("v1.5.5", "6316e1ad2c8ef5807519758bb159d314b9fef31d79ae27bc8f809104b978bb04")