update nix dependency to 0.27

this version requires the ioctl feature to be enabled to build our
source

Author: Pat Hickey

Cargo.toml

@@ -12,7 +12,7 @@ readme = "README.md"
 bitflags = "2.2.1"
 cfg-if = "^1.0.0"
 libc = "0.2.65"
-nix = "0.26"
+nix = { version = "0.27", features = ["ioctl"] }
 thiserror = "1.0.4"
 userfaultfd-sys = { path = "userfaultfd-sys", version = "^0.4.0" }