chore(cabal): update haskell language edition to GHC2021

This includes a good set of default language extensions that are
often used by us. It frees us of explicitly importing common extensions.

Ref: https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/control.html#extension-GHC2021

Signed-off-by: Taimoor Zaeem <taimoorzaeem@gmail.com>

test/spec/Feature/Auth/JwtCacheSpec.hs

@@ -1,4 +1,3 @@
-{-# LANGUAGE BangPatterns #-}
 module Feature.Auth.JwtCacheSpec where
 
 import qualified Data.Map as M

test/spec/Feature/ConcurrentSpec.hs

@@ -1,6 +1,5 @@
-{-# LANGUAGE MultiParamTypeClasses #-}
-{-# LANGUAGE TypeFamilies          #-}
-{-# LANGUAGE UndecidableInstances  #-}
+{-# LANGUAGE TypeFamilies         #-}
+{-# LANGUAGE UndecidableInstances #-}
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 module Feature.ConcurrentSpec where
 

test/spec/SpecHelper.hs

@@ -1,4 +1,3 @@
-{-# LANGUAGE TupleSections #-}
 module SpecHelper where
 
 import qualified Data.Aeson             as JSON