Remove bounds on gi-* packages

The latest versions in hackage should be buildable with both stack and
cabal new-build.

build-constraints.yaml

@@ -2418,21 +2418,18 @@ packages:
         - telegram-api
 
     "Iñaki García Etxebarria <garetxe@gmail.com> @garetxe":
-        # Pinned to versions not using custom-setup, since stack does
-        # not understand that syntax yet:
-        # https://github.com/commercialhaskell/stack/issues/2094
-        - gi-atk == 2.0.8
-        - gi-cairo == 1.0.8
-        - gi-gdk == 3.0.8
-        - gi-gdkpixbuf == 2.0.8
-        - gi-gio == 2.0.8
-        - gi-glib == 2.0.8
-        - gi-gobject == 2.0.8
-        - gi-gtk == 3.0.8
-        - gi-pango == 1.0.8
-        - gi-soup == 2.4.8
-        - gi-javascriptcore == 3.0.8
-        - gi-webkit == 3.0.8
+        - gi-atk
+        - gi-cairo
+        - gi-gdk
+        - gi-gdkpixbuf
+        - gi-gio
+        - gi-glib
+        - gi-gobject
+        - gi-gtk
+        - gi-pango
+        - gi-soup
+        - gi-javascriptcore == 3.0.*
+        - gi-webkit
         - haskell-gi
         - haskell-gi-base