Bump Cabal to < 3.18

Author: tomjaguarpaw

extensions.cabal

@@ -94,7 +94,7 @@ library
                        -- this causes problems in practice let's
                        -- revisit this decision and come up with
                        -- another approach.
-                     , Cabal-syntax ^>= 3.14
+                     , Cabal-syntax >= 3.14 && < 3.18
                      , containers >= 0.6 && < 0.9
                      , directory ^>= 1.3
                      , filepath >= 1.4 && < 1.6