Bump gherkin from 29.0.0 to 30.0.4 in /gremlin-dotnet #7673

Job	Run time
smoke	3m 22s
mvn clean install - jdk11	18m 17s
gremlin-server default	21m 40s
gremlin-console	6m 34s
cache gremlin-server docker image	6m 24s
gremlin-server unified	40m 50s
mvn clean install - jdk17	14m 13s
mvn clean install - jdk8	4m 6s
neo4j-gremlin	8m 48s
spark core (ubuntu-latest)	12m 29s
spark gryo (ubuntu-latest)	9m 42s
spark core (windows-latest)	3m 47s
spark gryo (windows-latest)	3m 37s
go	5m 23s
.NET	6m 2s
gremlin-driver	20m 14s
javascript (ubuntu-latest)	5m 46s
python	6m 3s
	3h 17m 17s

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