concio001: give the process a tiny little bit more time in the Makefile

- Although the test passed when run by itself, it did sometimes fail
  with validate as the timing just didn't work out on a loaded machine.

testsuite/tests/ghc-regress/lib/IO/Makefile

@@ -4,8 +4,8 @@ include $(TOP)/mk/test.mk
 
 test.concio001:
 	@$(TEST_HC) --make -fforce-recomp -v0 concio001 -o concio001 
-	@(sleep 0.4; echo x) | ./concio001
+	@(sleep 0.45; echo x) | ./concio001
 
 test.concio001.thr:
 	@$(TEST_HC) --make -fforce-recomp -v0 -threaded concio001 -o concio001 
-	@(sleep 0.4; echo x) | ./concio001
+	@(sleep 0.45; echo x) | ./concio001