Change imports to work with functored AST

Unfortunately due to https://gitlab.haskell.org/ghc/ghc/-/issues/19507
this cannot be perfectly seamless.

src/Text/Pandoc/Lua/Marshal/Citation.hs

@@ -1,4 +1,6 @@
+{-# LANGUAGE ExplicitNamespaces   #-}
 {-# LANGUAGE OverloadedStrings    #-}
+{-# LANGUAGE PatternSynonyms      #-}
 {- |
 Copyright               : © 2021-2022 Albert Krewinkel
 SPDX-License-Identifier : MIT
@@ -17,7 +19,8 @@ module Text.Pandoc.Lua.Marshal.Citation
 import Control.Applicative (optional)
 import Data.Maybe (fromMaybe)
 import HsLua as Lua
-import Text.Pandoc.Definition (Citation (..))
+import Text.Pandoc.Definition (Citation, pattern Citation)
+import Text.Pandoc.Definition.Functors hiding (type Citation)
 import Text.Pandoc.Lua.Marshal.CitationMode (peekCitationMode, pushCitationMode)
 import {-# SOURCE #-} Text.Pandoc.Lua.Marshal.Inline
   ( peekInlinesFuzzy, pushInlines )