Mark LoggingSpec pending on macOS

This might help reduce the unit test timeouts on macOS hydra builds.

Investigating #2472 Jonathan found the following tests to fail with limited ulimit -v:
    36% Match String: "Checkpoint"
    44% Match String: "correct time measures"
   100% Match String: "different request ids"
    20% Match String: "Private Key"
    32% Match String: "Tx History"
    28% Match String: "Wallet Metadata"

where entries 2 and 3 are from LogginsSpec.

The timeouts in CI were in these following locations:

  12 times (28%) 000000 // from "Not Allowed Methods"
  9 times (21%) Checkpoint
  8 times (19%) rollback
  5 times (12%) 8601 // from e.g. "ISO 8601 extended format without timezones"
  4 times (9%) JSON
  4 times (9%) MVar
  4 times (9%) readStakeDistribution // only in the past, so now fixed
  1 times (2%) Coverage

which either suggest there are an 10+ lines of output not shown in the
output, or the LoggingSpec isn't to blame.

So it would be very interesting to see whether this commit reduces
timeouts or not.

lib/core/test/unit/Network/Wai/Middleware/LoggingSpec.hs

@@ -96,6 +96,8 @@ import Test.QuickCheck
  ( Arbitrary (..), choose, counterexample, property, withMaxSuccess )
 import Test.QuickCheck.Monadic
  ( assert, monadicIO, monitor )
+import Test.Utils.Darwin
+ ( pendingOnMacOS )
 import UnliftIO.Async
  ( Async, async, cancel, mapConcurrently, replicateConcurrently_ )
 import UnliftIO.Concurrent
@@ -113,7 +115,9 @@ import qualified Data.Text as T
 import qualified Network.Wai.Handler.Warp as Warp
 
 spec :: Spec
-spec = describe "Logging Middleware" $ do
+spec = before (pendingOnMacOS "#2472 regular timeouts in macOS hydra builds")
+ $ describe "Logging Middleware" $ do
+
  before setup $ after tearDown $ do
  it "GET, 200, no query" $ \ctx -> do
  get ctx "/get"