global: use IOTty instead of IOPty

These are both equivalent to one another, and we're about to convert the
IOPty package to become an alias of IOTty. It follows that the IOPty
package will only be available when `conf.allowAliases = true`.

pkgs/by-name/co/cope/package.nix

@@ -19,7 +19,7 @@ perlPackages.buildPerlPackage {
   buildInputs = with perlPackages; [
     EnvPath
     FileShareDir
-    IOPty
+    IOTty
     IOStty
     ListMoreUtils
     RegexpCommon

pkgs/by-name/re/rex/package.nix

@@ -70,7 +70,7 @@ perlPackages.buildPerlPackage rec {
     FileLibMagic
     HashMerge
     HTTPMessage
-    IOPty
+    IOTty
     IOString
     JSONMaybeXS
     LWP