Mark http2 and uniform-transforms as broken on 8.8

ci/broken-packages.sh

@@ -33,6 +33,9 @@ version="$(ghc_version)"
 echo "Found GHC $version."
 case $version in
   8.8.*)
+    #       package             ticket
+    broken "http2"              16288
+    broken "unicode-transforms" 16288
     ;;
 
   8.9.*)