conduit: Fix tests for GHC 9.2

[hololeap]

Similar fix to #473

Tests were failing to compile with

test/main.hs:267:49: error:
    • Couldn't match type: forall b2.
                           (() -> CI.Pipe o5 o5 o5 () m5 b2) -> CI.Pipe o5 o5 o5 () m5 b2
                     with: (r2 -> CI.Pipe l2 i4 o4 u2 m4 r2)
                           -> CI.Pipe
                                b1
                                b1
                                Int
                                ()
                                (Control.Monad.Trans.Resource.Internal.ResourceT IO)
                                ()
      Expected: ConduitT o5 o5 m5 ()
                -> (r2 -> CI.Pipe l2 i4 o4 u2 m4 r2)
                -> CI.Pipe
                     b1
                     b1
                     Int
                     ()
                     (Control.Monad.Trans.Resource.Internal.ResourceT IO)
                     ()
        Actual: ConduitT o5 o5 m5 ()
                -> forall b.
                   (() -> CI.Pipe o5 o5 o5 () m5 b) -> CI.Pipe o5 o5 o5 () m5 b
    • In the expression: CI.unConduitT
      In the first argument of ‘($)’, namely ‘(`CI.unConduitT` CI.Done)’
      In the first argument of ‘CI.injectLeftovers’, namely
        ‘((`CI.unConduitT` CI.Done) $ CL.map (* 2))’
    |
267 |                     CI.>+> CI.injectLeftovers ((`CI.unConduitT` CI.Done) $ CL.map (* 2))) >>=)
    |

(etc)

[snoyberg]

Thanks!