io-classes:mtl: newArray for MArray ContTSTM instance

It is needed since `array-0.5.7` used by `ghc-9.8.4`.  In other `MArray`
instances we provide it, so let's do the same for this instance.

Author: coot

io-classes/mtl/Control/Monad/Class/MonadSTM/Trans.hs

@@ -54,9 +54,7 @@ instance ( MonadSTM m, MArray e a (STM m) ) => MArray e a (ContTSTM r m) where
     getNumElements    = ContTSTM . getNumElements
     unsafeRead arr    = ContTSTM . unsafeRead arr
     unsafeWrite arr i = ContTSTM . unsafeWrite arr i
-#if __GLASGOW_HASKELL__ >= 910
     newArray idxs     = ContTSTM . newArray idxs
-#endif
 
 
 -- note: this (and the following) instance requires 'UndecidableInstances'