windows: upgrade mycelium to v0.5.7

Author: iwanbk

mycelffi/Cargo.lock

@@ -9,4 +9,4 @@ crate-type = ["cdylib"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-mobile = { git = "http://github.com/threefoldtech/mycelium", package = "mobile", tag = "v0.5.6" }
+mobile = { git = "http://github.com/threefoldtech/mycelium", package = "mobile", tag = "v0.5.7" }