[BUG] Gremlin profile fails on older Neptune DB versions

[michaelnchin]

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Describe the bug

When using %%gremlin profile on Neptune Database v1.2.0.0.R4, the default value for the --profile-serializer (GRAPHSON_V3_UNTYPED) option results in the following error:

This engine version only supports the following following serializers:

"application/json" or "GRAPHSON"
"application/vnd.gremlin-v1.0+json" or "GRAPHSON_V1"
"application/vnd.gremlin-v2.0+json" or "GRAPHSON_V2"
"application/vnd.gremlin-v3.0+json" or "GRAPHSON_V3"

Expected behavior

%%gremlin profile should work out of the box with DB 1.2 major version.