Update inno setup x64 flag to x64compatible (#3005)

Inno Setup is used to create installers for release, and it no longer supports the ia64 flag and recommends x64compatible instead. See https://jrsoftware.org/ishelp/index.php?topic=setup_architecturesinstallin64bitmode

Author: Greg Weresch

.github/win/windows-installer-v8-x64.iss

@@ -5,8 +5,8 @@ AppName=Cloud Foundry CLI
 AppVersion=VERSION
 AppVerName=Cloud Foundry CLI version VERSION
 AppPublisher=Cloud Foundry Foundation
-ArchitecturesInstallIn64BitMode=x64 ia64
-ArchitecturesAllowed=x64 ia64
+ArchitecturesInstallIn64BitMode=x64compatible
+ArchitecturesAllowed=x64compatible
 PrivilegesRequired=none
 DefaultDirName={pf}\Cloud Foundry
 SetupIconFile=cf.ico