Update aws-c-cal to v0.8.1 (#5787)

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

@@ -6,6 +6,7 @@ package("aws-c-cal")
     add_urls("https://github.com/awslabs/aws-c-cal/archive/refs/tags/$(version).tar.gz",
              "https://github.com/awslabs/aws-c-cal.git")
 
+    add_versions("v0.8.1", "4d603641758ef350c3e5401184804e8a6bba4aa5294593cc6228b0dca77b22f5")
     add_versions("v0.8.0", "3803311ee7c73446a35466199084652ec5f76dedcf20452ebdbba8ed34d4230d")
     add_versions("v0.7.4", "8020ecbe850ceb402aa9c81a1ef34e3becdbcb49587a1b19eb5c7e040f369b58")
     add_versions("v0.7.2", "265938e3f1d2baa6a555ec6b0a27c74d3f505cbe7c96f7539ada42d5a848dee9")