Update to windows-sys 0.61

Tokio and mio already updated to windows-sys 0.61, so socket2 requiring
0.60 makes it hard to avoid multiple copies of windows-sys.

Since no code changes are needed, I relaxed the version requirement
(still allowing 0.60) to avoid increasing socket2's MSRV.

Author: hanna-kruppe

Cargo.toml

@@ -53,7 +53,7 @@ features = ["all"]
 libc = "0.2.172"
 
 [target.'cfg(windows)'.dependencies.windows-sys]
-version = "0.60"
+version = ">=0.60, <0.62"
 features = [
   "Win32_Foundation",
   "Win32_Networking_WinSock",