Update managed to the latest version

Cargo.toml

@@ -16,7 +16,7 @@ license = "0BSD"
 autoexamples = false
 
 [dependencies]
-managed = { version = "0.7", default-features = false, features = ["map"] }
+managed = { version = "0.8", default-features = false, features = ["map"] }
 byteorder = { version = "1.0", default-features = false }
 log = { version = "0.4.4", default-features = false, optional = true }
 libc = { version = "0.2.18", optional = true }