Update bug tracker location

Cabal/Cabal.cabal

@@ -8,7 +8,7 @@ Author: Isaac Jones <ijones@syntaxpolice.org>
         Duncan Coutts <duncan@community.haskell.org>
 Maintainer: cabal-devel@haskell.org
 Homepage: http://www.haskell.org/cabal/
-bug-reports: http://hackage.haskell.org/trac/hackage/
+bug-reports: https://github.com/haskell/cabal/issues
 Synopsis: A framework for packaging Haskell software
 Description:
         The Haskell Common Architecture for Building Applications and

cabal-install/cabal-install.cabal

@@ -6,7 +6,7 @@ Description:
     Haskell software by automating the fetching, configuration, compilation
     and installation of Haskell libraries and programs.
 homepage:           http://www.haskell.org/cabal/
-bug-reports:        http://hackage.haskell.org/trac/hackage/
+bug-reports:        https://github.com/haskell/cabal/issues
 License:            BSD3
 License-File:       LICENSE
 Author:             Lemmih <lemmih@gmail.com>