Bump containers to < 0.8

tomland.cabal

@@ -134,7 +134,7 @@ library
                            Toml.Type.Value
 
   build-depends:       bytestring >= 0.10 && < 0.13
-                     , containers >= 0.5.7 && < 0.7
+                     , containers >= 0.5.7 && < 0.8
                      , deepseq >= 1.4 && < 1.6
                      , hashable >= 1.3.1.0 && < 1.5
                      , megaparsec >= 7.0.5 && < 9.7