Update unordered_dense to 4.0.4 (#2440)

packages/u/unordered_dense/xmake.lua

@@ -10,6 +10,7 @@ package("unordered_dense")
     add_versions("v1.4.0", "36b6bfe2fe2633f9d9c537b9b808b4be6b77ff51c66d370d855f477517bc3bc9")
     add_versions("v2.0.2", "d4be48c164fa2f49deb55354b33c335688da3bd4b2299b3a46b8092602f67556")
     add_versions("v3.0.0", "e73452d7c1e274b4a15b553c0904f1de4bcfa61b00514acd1eaad7deac805ef0")
+    add_versions("v4.0.4", "b34a8c942963e3a647f1bbc192a6391cd56d7ae615b2ddc1601c1779b5792206")
 
 
     add_deps("cmake")