Move release dev note to post-release #2120

Job	Run time
smoke	2m 55s
gremlin-server unified	22m 47s
gremlin-console	5m 38s
cache gremlin-server docker image	1m 35s
gremlin-server default	24m 11s
mvn clean install - jdk11	16m 57s
mvn clean install - jdk8	13m 30s
neo4j-gremlin	8m 30s
spark core (ubuntu-latest)	11m 48s
spark core (windows-latest)	3m 25s
spark gryo (ubuntu-latest)	8m 52s
spark gryo (windows-latest)	3m 29s
javascript (ubuntu-latest)	5m 29s
.NET	5m 29s
go	5m 46s
gremlin-driver	3m 39s
python	6m 15s
	2h 30m 15s

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