Update boost_ut to v2.1.1 (#6015)

packages/b/boost_ut/xmake.lua

@@ -6,6 +6,7 @@ package("boost_ut")
 
     add_urls("https://github.com/boost-ext/ut/archive/refs/tags/$(version).tar.gz")
     add_urls("https://github.com/boost-ext/ut.git")
+    add_versions("v2.1.1", "016ac5ece1808cd1100be72f90da4fa59ea41de487587a3283c6c981381cc216")
     add_versions("v2.1.0", "1c9c35c039ad3a9795a278447db6da0a4ec1a1d223bf7d64687ad28f673b7ae8")
     add_versions("v1.1.9", "1a666513157905aa0e53a13fac602b5673dcafb04a869100a85cd3f000c2ed0d")
     add_versions("v2.0.1", "1e43be17045a881c95cedc843d72fe9c1e53239b02ed179c1e39e041ebcd7dad")