Simplify GetNewSequenceNumber #273

Job	Run time
test-ubuntu-latest-Security.Certificates	2m 34s
test-ubuntu-latest-Core	3m 46s
test-ubuntu-latest-Server	4m 20s
test-ubuntu-latest-Client	24m 47s
test-ubuntu-latest-Client.ComplexTypes	3m 28s
test-ubuntu-latest-PubSub	3m 17s
test-ubuntu-latest-Configuration	2m 23s
test-ubuntu-latest-Gds	3m 27s
test-windows-latest-Security.Certificates	2m 43s
test-windows-latest-Core	4m 30s
test-windows-latest-Server	5m 5s
test-windows-latest-Client	25m 2s
test-windows-latest-Client.ComplexTypes	4m 7s
test-windows-latest-PubSub	4m 33s
test-windows-latest-Configuration	3m 12s
test-windows-latest-Gds	4m 41s
test-macOS-latest-Security.Certificates	2m 7s
test-macOS-latest-Core	23m 45s
test-macOS-latest-Server	4m 6s
test-macOS-latest-Client	18m 59s
test-macOS-latest-Client.ComplexTypes	3m 4s
test-macOS-latest-PubSub	3m 33s
test-macOS-latest-Configuration	1m 55s
test-macOS-latest-Gds	2m 44s
	2h 42m 8s

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