Update timezone data on Windows

There is new Yukon Standard time Windows timezone.

Also fix the powershell script that generates the Windows locale mapping,
tell powershell to use TLSv1.2 to access the github (on some reason it is
TLS1.1 that powershell is using by default, and it does no work)

sql/gen_win_tzname_data.ps1

@@ -4,6 +4,7 @@
 
 write-output  "/* This file  was generated using gen_win_tzname_data.ps1 */"
 $xdoc = new-object System.Xml.XmlDocument
+[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
 $xdoc.load("https://raw.githubusercontent.com/unicode-org/cldr/master/common/supplemental/windowsZones.xml")
 $nodes = $xdoc.SelectNodes("//mapZone[@territory='001']") # use default territory (001)
 foreach ($node in $nodes) {

sql/win_tzname_data.h

@@ -12,6 +12,7 @@
 {L"US Mountain Standard Time","America/Phoenix"},
 {L"Mountain Standard Time (Mexico)","America/Chihuahua"},
 {L"Mountain Standard Time","America/Denver"},
+{L"Yukon Standard Time","America/Whitehorse"},
 {L"Central America Standard Time","America/Guatemala"},
 {L"Central Standard Time","America/Chicago"},
 {L"Easter Island Standard Time","Pacific/Easter"},