git-annex: update hash for version 6.20171214

pkgs/development/haskell-modules/configuration-common.nix

···
       name = "git-annex-${drv.version}-src";
       url = "git://git-annex.branchable.com/";
       rev = "refs/tags/" + drv.version;
-      sha256 = "1bnnrwamw3d37fz7cwykxhi1ryy22dq8r6ld59gsbgcv23drqzax";
+      sha256 = "1fd7lyrwr60dp55swc5iwl0mkkzmdzpmj9qmx1qca2r7y9wc5w5k";
     };
   })).override {
     dbus = if pkgs.stdenv.isLinux then self.dbus else null;