ouroboros-network-framework: utf8 characters are not always well supported

On nix and Windows the following error can be observed
```
<stdout>: commitBuffer: invalid argument (invalid character)
```
This is misconfiguration of the locale, but the easiest way to fix it is
to avoid the `→` character all together.

Author: coot

ouroboros-network-framework/src/Ouroboros/Network/ConnectionManager/Types.hs

@@ -874,7 +874,7 @@ instance Show state
       => Show (Transition' state) where
     show Transition { fromState, toState } =
       concat [ show fromState
-             , " → "
+             , " -> "
              , show toState
              ]
 

ouroboros-network-framework/test/Test/Ouroboros/Network/Server2.hs

@@ -3695,7 +3695,7 @@ splitRemoteConns =
 
 ppTransition :: AbstractTransition -> String
 ppTransition Transition {fromState, toState} =
-    printf "%-30s → %s" (show fromState) (show toState)
+    printf "%-30s -> %s" (show fromState) (show toState)
 
 ppScript :: (Show peerAddr, Show req) => MultiNodeScript peerAddr req -> String
 ppScript (MultiNodeScript script _) = intercalate "\n" $ go 0 script