Fix failing test

Author: nbacquey

cardano-testnet/test/cardano-testnet-test/Cardano/Testnet/Test/UpdateTimeStamps.hs

@@ -44,13 +44,10 @@ hprop_update_time_stamps = integrationRetryWorkspace 2 "update-time-stamps" $ \t
   -- the time bounds in the sandbox' config files are no longer valid
   H.threadDelay $ double2Int $ realToFrac startTimeOffsetSeconds * 1_000_000 * 1.2
 
-  -- Call `createTestnetEnv` again to update the time stamps
-  createTestnetEnv
-    testnetOptions genesisOptions
-    def
+  -- Run testnet and specify to update time stamps before starting
+  runtime <- cardanoTestnet
+    testnetOptions
+    genesisOptions
     conf{updateTimestamps = UpdateTimestamps}
 
-  -- Run testnet with generated config
-  runtime <- cardanoTestnet testnetOptions genesisOptions conf
-
   nodesProduceBlocks tmpDir runtime