Fix ambiguous import of `elem`

[phagenlocher]

I've run into trouble trying to create a docker container for asciidoctor that runs on arm64.

As of right now erd can not be installed on Alpine Linux 3.17 arm64 using cabal v2-update && cabal v2-install erd. When building the following error occurs:

Configuring executable 'erd' for erd-0.2.1.0..
Preprocessing executable 'erd' for erd-0.2.1.0..
Building executable 'erd' for erd-0.2.1.0..
[1 of 7] Compiling Erd.ER           ( src/Erd/ER.hs, dist/build/erd/erd-tmp/Erd/ER.o, dist/build/erd/erd-tmp/Erd/ER.dyn_o )
[2 of 7] Compiling Erd.Render       ( src/Erd/Render.hs, dist/build/erd/erd-tmp/Erd/Render.o, dist/build/erd/erd-tmp/Erd/Render.dyn_o )
[3 of 7] Compiling Paths_erd        ( dist/build/erd/autogen/Paths_erd.hs, dist/build/erd/erd-tmp/Paths_erd.o, dist/build/erd/erd-tmp/Paths_erd.dyn_o )
[4 of 7] Compiling Erd.Config       ( src/Erd/Config.hs, dist/build/erd/erd-tmp/Erd/Config.o, dist/build/erd/erd-tmp/Erd/Config.dyn_o )
[5 of 7] Compiling Text.Parsec.Erd.Parser ( src/Text/Parsec/Erd/Parser.hs, dist/build/erd/erd-tmp/Text/Parsec/Erd/Parser.o, dist/build/erd/erd-tmp/Text/Parsec/Erd/Parser.dyn_o )

src/Text/Parsec/Erd/Parser.hs:64:27: error:
    Ambiguous occurrence ‘elem’
    It could refer to
       either ‘Prelude.elem’,
              imported from ‘Prelude’ at src/Text/Parsec/Erd/Parser.hs:3:8-29
              (and originally defined in ‘Data.Foldable’)
           or ‘Data.Text.Lazy.elem’,
              imported from ‘Data.Text.Lazy’ at src/Text/Parsec/Erd/Parser.hs:20:1-31
   |
64 |   let (ispk, isfk) = ('*' `elem` keys, '+' `elem` keys)
   |                           ^^^^^^

src/Text/Parsec/Erd/Parser.hs:64:44: error:
    Ambiguous occurrence ‘elem’
    It could refer to
       either ‘Prelude.elem’,
              imported from ‘Prelude’ at src/Text/Parsec/Erd/Parser.hs:3:8-29
              (and originally defined in ‘Data.Foldable’)
           or ‘Data.Text.Lazy.elem’,
              imported from ‘Data.Text.Lazy’ at src/Text/Parsec/Erd/Parser.hs:20:1-31
   |
64 |   let (ispk, isfk) = ('*' `elem` keys, '+' `elem` keys)
   |                                            ^^^^^^
Error: cabal: Failed to build exe:erd from erd-0.2.1.0. See the build log
above for details.

I suppose this is due to Alpine using GHC 9.0.2.

This PR fixes this issue, which would arise later when bumping the stack-resolver version to 19.5 or beyond.

[mmzx]

Thank you, missed this MR somehow.