Bump 'tar' upper bound (commercialhaskell/stackage#1116)

Author: borsboom

stack.cabal

@@ -185,7 +185,7 @@ library
                    , split
                    , stm >= 2.4.4
                    , streaming-commons >= 0.1.10.0
-                   , tar >= 0.4.1.0
+                   , tar >= 0.4.1.0 && < 0.6
                    , template-haskell >= 2.9.0.0
                    , temporary >= 1.2.0.3
                    , text >= 1.2.0.4