Update upper bound limit for http-client (#1384)

Author: mimi1vx

servant-client/servant-client.cabal

@@ -64,7 +64,7 @@ library
   -- Here can be exceptions if we really need features from the newer versions.
   build-depends:
       base-compat           >= 0.10.5   && < 0.12
-    , http-client           >= 0.5.13.1 && < 0.7
+    , http-client           >= 0.5.13.1 && < 0.8
     , http-media            >= 0.7.1.3  && < 0.9
     , http-types            >= 0.12.2   && < 0.13
     , exceptions            >= 0.10.0   && < 0.11