Update simdutf to v5.2.6 (#3948)

packages/s/simdutf/xmake.lua

@@ -6,6 +6,7 @@ package("simdutf")
     add_urls("https://github.com/simdutf/simdutf/archive/refs/tags/$(version).tar.gz",
              "https://github.com/simdutf/simdutf.git")
 
+    add_versions("v5.2.6", "ab9e56facf7cf05f4e9d062a0adef310fc6a0f82a8132e8ec1e1bb7ab5e234df")
     add_versions("v5.2.4", "36281d6489a4a8c2b5bfac2d41c03dce8fc89ec1cda15cc05c53d44f5ad30b4d")
     add_versions("v5.2.3", "dfa55d85c3ee51e9b52e55c02701b16f83dcf1921e1075b67f99b1036df5adb8")
     add_versions("v4.0.9", "599e6558fc8d06f8346e5f210564f8b18751c93d83bce1a40a0e6a326c57b61e")