Relax upper bound on process to allow process-1.4

The only change between process 1.3 and 1.4 is:

"Added child_user and child_group to CreateProcess for unix. #45"

And the relevant code in Cabal doesn't seem affected by those additional
members.

Cabal/Cabal.cabal

@@ -152,7 +152,7 @@ library
     directory  >= 1.1 && < 1.3,
     filepath   >= 1.3 && < 1.5,
     pretty     >= 1.1 && < 1.2,
-    process    >= 1.1.0.1 && < 1.4,
+    process    >= 1.1.0.1 && < 1.5,
     time       >= 1.4 && < 1.6
 
   if flag(bundled-binary-generic)

cabal-install/cabal-install.cabal

@@ -179,7 +179,7 @@ executable cabal
                      process   >= 1.0.1.1  && < 1.1.0.2
     else
       build-depends: directory >= 1.2 && < 1.3,
-                     process   >= 1.1.0.2  && < 1.4
+                     process   >= 1.1.0.2  && < 1.5
 
     -- NOTE: you MUST include the network dependency even when network-uri
     -- is pulled in, otherwise the constraint solver doesn't have enough