T13330 fails sporatically on Windows

T13330 appears to fails every once in a while on Windows:

--- "C:/GitLabRunner/builds/2WeHDSFP/0/ghc/ghc/tmp/ghctest-d__9bkso/test   spaces/testsuite/tests/concurrent/should_run/T13330.run/T13330.stderr.normalised"	2020-10-21 15:48:19.306187300 +0000
+++ "C:/GitLabRunner/builds/2WeHDSFP/0/ghc/ghc/tmp/ghctest-d__9bkso/test   spaces/testsuite/tests/concurrent/should_run/T13330.run/T13330.run.stderr.normalised"	2020-10-21 15:48:19.306187300 +0000
@@ -1,3 +0,0 @@
-T13330: Successful exception
-CallStack (from HasCallStack):
-  error, called at T13330.hs:<line>:<column> in <package-id>:Main

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