Drop Parsec dependency in cabal-install

cabal-install/cabal-install.cabal

@@ -320,7 +320,6 @@ library
         zlib       >= 0.5.3    && < 0.7,
         hackage-security >= 0.5.2.2 && < 0.6,
         text       >= 1.2.3    && < 1.3,
-        parsec     >= 3.1.13.0 && < 3.2,
         zip-archive >= 0.3.2.5 && < 0.4
 
     if flag(native-dns)
@@ -400,7 +399,6 @@ executable cabal
             zlib       >= 0.5.3    && < 0.7,
             hackage-security >= 0.5.2.2 && < 0.6,
             text       >= 1.2.3    && < 1.3,
-            parsec     >= 3.1.13.0 && < 3.2,
             zip-archive >= 0.3.2.5 && < 0.4
 
         other-modules: