Update nix to 0.24

Author: taiki-e

Cargo.toml

@@ -10,8 +10,6 @@ rust-version = "1.46"
 description = "Async I/O and timers"
 license = "Apache-2.0 OR MIT"
 repository = "https://github.com/smol-rs/async-io"
-homepage = "https://github.com/smol-rs/async-io"
-documentation = "https://docs.rs/async-io"
 keywords = ["mio", "epoll", "kqueue", "iocp", "wepoll"]
 categories = ["asynchronous", "network-programming", "os"]
 exclude = ["/.*"]
@@ -34,16 +32,16 @@ libc = "0.2.77"
 winapi = { version = "0.3.9", features = ["winsock2"] }
 
 [dev-dependencies]
-async-channel = "1.4.2"
-async-net = "1.3.0"
-blocking = "1.0.0"
+async-channel = "1"
+async-net = "1"
+blocking = "1"
 signal-hook = "0.3"
-tempfile = "3.1.0"
+tempfile = "3"
 
 [target.'cfg(target_os = "linux")'.dev-dependencies]
 inotify = { version = "0.10", default-features = false }
-nix = "0.23"
-timerfd = "1.1.1"
+nix = "0.24"
+timerfd = "1"
 
 [target.'cfg(windows)'.dev-dependencies]
 uds_windows = "1"