Remove conflicting re-export to toText

```
src/Json/Extras.hs:8:3-18: error: [GHC-69158]
    Conflicting exports for ‘toText’:
       ‘TextShort.toText’ exports ‘TextShort.toText’
         imported qualified from ‘Data.Text.Short’ at src/Json/Extras.hs:21:1-45
         (and originally defined in ‘text-short-0.1.6:Data.Text.Short.Internal’)
       ‘module Json’ exports ‘Json.toText’
         imported from ‘Json’ at src/Json/Extras.hs:26:1-25
  |
8 |   TextShort.toText,
  |   ^^^^^^^^^^^^^^^^
```

src/Json/Extras.hs

@@ -5,7 +5,6 @@ module Json.Extras (
   -- * Data types
   module Json,
   ShortText,
-  TextShort.toText,
 
   -- * Extras
   decodeThrow,