Bump to containers < 0.9

Author: tomjaguarpaw

extensions.cabal

@@ -95,7 +95,7 @@ library
                        -- revisit this decision and come up with
                        -- another approach.
                      , Cabal-syntax ^>= 3.14
-                     , containers >= 0.6 && < 0.8
+                     , containers >= 0.6 && < 0.9
                      , directory ^>= 1.3
                      , filepath >= 1.4 && < 1.6
                      , ghc-boot-th >= 8.8.1 && < 9.13