Revert "Mark th-lift-instances as broken due to ghc/ghc#17723"

This reverts commit 1b5f3dc5.

This is no longer needed as the latest `th-lift-instances` Hackage
release, 0.1.16, no longer suffers from ghc/ghc#17723. See
https://github.com/bennofs/th-lift-instances/issues/19.

ci/config.sh

@@ -63,15 +63,9 @@ version="$(ghc_version)"
 commit="$(ghc_commit)"
 echo "Found GHC $version, commit $commit."
 case $version in
-  8.10.*)
-    #       package             ticket
-    broken "th-lift-instances"  17723
-    ;;
-
   8.11.*)
     #       package             ticket
     broken "pandoc"             18018
-    broken "th-lift-instances"  17723
     ;;
 
   *)