Bump nushell-sytem dep to ntapi 0.4

0.3.7 trigger a warning about code being incompatible
with future rust versions. This is resolved in 0.4
MSxDOS/ntapi#11

crates/nu-system/Cargo.toml

@@ -32,5 +32,5 @@ mach2 = "0.4"
 [target.'cfg(target_os = "windows")'.dependencies]
 winapi = { version = "0.3.9", features = ["tlhelp32", "fileapi", "handleapi", "ifdef", "ioapiset", "minwindef", "pdh", "psapi", "synchapi", "sysinfoapi", "winbase", "winerror", "winioctl", "winnt", "oleauto", "wbemcli", "rpcdce", "combaseapi", "objidl", "powerbase", "netioapi", "lmcons", "lmaccess", "lmapibuf", "memoryapi", "shellapi", "std", "securitybaseapi"] }
 chrono = "0.4.21"
-ntapi = "0.3"
+ntapi = "0.4"
 once_cell = "1.0"