Monoid (Conc m a) has noncanonical mappend instance

[philderbeast]

When compiling with ghc-9.2.3:

unliftio          > /.../UnliftIO/Internals/Async.hs:513:3: warning: [-Wnoncanonical-monoid-instances]
unliftio          >     Noncanonical ‘mappend’ definition detected
unliftio          >     in the instance declaration for ‘Monoid (Conc m a)’.
unliftio          >     ‘mappend’ will eventually be removed in favour of ‘(<>)’
unliftio          >     Either remove definition for ‘mappend’ (recommended) or define as ‘mappend = (<>)’
unliftio          >     See also: https://gitlab.haskell.org/ghc/ghc/-/wikis/proposal/semigroup-monoid
unliftio          >     |
unliftio          > 513 |   mappend = liftA2 mappend

unliftio/unliftio/src/UnliftIO/Internals/Async.hs

Lines 510 to 514 in de13c44

	instance (Monoid a, MonadUnliftIO m) => Monoid (Conc m a) where
	mempty = pure mempty
	{-# INLINE mempty #-}
	mappend = liftA2 mappend
	{-# INLINE mappend #-}