cardano-node: fixes:

- no warnings for ghc 9 
redundant-constraints

Author: jutaro

cardano-node/src/Cardano/Node/Tracing/Tracers.hs

@@ -9,6 +9,9 @@
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeApplications #-}
 
+{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
+-- needs different instances on ghc8 and on ghc9
+
 module Cardano.Node.Tracing.Tracers
   ( mkDispatchTracers
   ) where

cardano-node/src/Cardano/Tracing/Tracers.hs

@@ -17,6 +17,9 @@
 {-# LANGUAGE UndecidableInstances #-}
 
 {-# OPTIONS_GHC -Wno-orphans  #-}
+{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
+-- needs different instances on ghc8 and on ghc9
+
 
 module Cardano.Tracing.Tracers
   ( Tracers (..)
@@ -136,6 +139,9 @@ import qualified Control.Concurrent.STM as STM
 import           Cardano.Protocol.TPraos.OCert (KESPeriod (..))
 import qualified Data.Aeson.KeyMap as KeyMap
 
+{-# OPTIONS_GHC -Wno-redundant-constraints #-}
+-- needs different instances on ghc8 and on ghc9
+
 {- HLINT ignore "Redundant bracket" -}
 {- HLINT ignore "Use record patterns" -}