Update to windows-sys 0.45. (#529)

Author: sunfishcode

Cargo.toml

@@ -60,7 +60,7 @@ linux-raw-sys = { version = "0.1.2", default-features = false, features = ["gene
 
 # For the libc backend on Windows, use the Winsock2 API in windows-sys.
 [target.'cfg(windows)'.dependencies.windows-sys]
-version = "0.42.0"
+version = "0.45.0"
 features = [
     "Win32_Foundation",
     "Win32_Networking_WinSock",