Bumped next release version to v3.9.1 #34

Job	Run time
Coverage / latest - nats:main	3m 25s
Coverage / latest - nats:main	3m 25s
No Streaming / latest - nats:latest	4m 22s
No Streaming / latest - nats:latest	3m 21s
check for flaky tests / latest - nats:main	15m 24s
check for flaky tests / latest - nats:main	15m 24s
Benchmark / latest - nats:main	6m 3s
Benchmark / latest - nats:main	6m 3s
Older compilers (clang-8) / 20.04 - nats:latest	4m 1s
Older compilers (clang-8) / 20.04 - nats:latest	4m 1s
Older compilers (gcc-7) / 20.04 - nats:latest	3m 52s
Older compilers (gcc-7) / 20.04 - nats:latest	3m 52s
Older compilers (gcc-8) / 20.04 - nats:latest	3m 52s
Older compilers (gcc-8) / 20.04 - nats:latest	3m 52s
Other servers (latest) / latest - nats:latest	3m 37s
Other servers (latest) / latest - nats:latest	3m 37s
Other servers (v2.9.11) / latest - nats:v2.9.11	3m 19s
Other servers (v2.9.11) / latest - nats:v2.9.11	3m 19s
No TLS (clang) / latest - nats:latest	3m 22s
No TLS (clang) / latest - nats:latest	3m 22s
No TLS (gcc) / latest - nats:latest	3m 26s
No TLS (gcc) / latest - nats:latest	3m 26s
	1h 48m 25s

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