Remove redundant six dependency (#2692) #6395

Job	Run time
smoke	4m 23s
smoke	2m 52s
mvn clean install - jdk11	0s
mvn clean install - jdk11	16m 21s
gremlin-server unified	0s
gremlin-server unified	23m 3s
mvn clean install - jdk8	0s
mvn clean install - jdk8	13m 44s
gremlin-server default	0s
gremlin-server default	24m 10s
gremlin-console	0s
gremlin-console	5m 46s
neo4j-gremlin	0s
neo4j-gremlin	8m 27s
cache gremlin-server docker image	0s
cache gremlin-server docker image	1m 43s
spark core	0s
spark gryo	0s
go	0s
go	6m 1s
.NET	0s
.NET	5m 35s
gremlin-driver	0s
gremlin-driver	4m 3s
javascript	0s
python	0s
python	8m 43s
spark core (ubuntu-latest)	11m 38s
spark gryo (ubuntu-latest)	8m 53s
spark core (windows-latest)	3m 21s
spark gryo (windows-latest)	3m 50s
javascript (ubuntu-latest)	6m 11s
	2h 38m 44s

Provide feedback