Fix aeson < 2 compat again

Author: michaelpj

lsp-types/lsp-types.cabal

@@ -79,6 +79,7 @@ library
     , exceptions
     , hashable          >=1.3.4.0
     , indexed-traversable
+    , indexed-traversable-instances
     , lens              >=4.15.2
     , lens-aeson
     , mod

lsp-types/src/Language/LSP/Protocol/Utils/Misc.hs

@@ -16,6 +16,7 @@ import           Data.Aeson
 import           Data.Aeson.Text     as Aeson
 import qualified Data.Foldable       as F
 import qualified Data.Foldable.WithIndex as F
+import qualified Data.Functor.WithIndex.Instances ()
 import           Data.List           hiding (group)
 import           Data.Maybe          (mapMaybe)
 import           Language.Haskell.TH