Update aws-c-mqtt to v0.10.3 (#3612)

packages/a/aws-c-mqtt/xmake.lua

@@ -6,6 +6,7 @@ package("aws-c-mqtt")
     add_urls("https://github.com/awslabs/aws-c-mqtt/archive/refs/tags/$(version).tar.gz",
              "https://github.com/awslabs/aws-c-mqtt.git")
 
+    add_versions("v0.10.3", "bb938d794b0757d669b5877526363dc6f6f0e43869ca19fc196ffd0f7a35f5b9")
     add_versions("v0.9.5", "987289535d3c988fe949f49d81268736c96fe27b27c98c899f0a148577f6627b")
 
     add_configs("asan", {description = "Enable Address Sanitize.", default = false, type = "boolean"})