Addressed race conditions and flaky tests in QUIC transport (#485) #184

Job	Run time
continuous-integration (8.10.7)	6m 2s
continuous-integration (9.8.4)	6m 26s
continuous-integration (9.14.1, --allow-newer=base --allow-newer=template-haskell)	5m 1s
continuous-integration (9.0.2)	17m 41s
continuous-integration (9.6.7)	6m 32s
continuous-integration (9.4.8)	6m 18s
continuous-integration (9.10.3)	7m 23s
continuous-integration (9.2.8)	5m 34s
continuous-integration (9.12.2)	6m 54s
	1h 7m 51s

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