fix: ParallelSteps swagger.json

[crenshaw-dev]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
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This hacks the incorrectly-inferred object type for ParallelSteps back to an array. Closes #2454. Will also fix argoproj-labs/argo-client-java#1 downstream.

jq converts a bunch of unicode-encoded characters to ascii. As far as I can tell, that should have no negative effects.

I also added some go get lines for dependencies which were missing on my machine.

[codecov]

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@@            Coverage Diff            @@
##             master    #2459   +/-   ##
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  Coverage          ?   11.26%           
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  Files             ?       72           
  Lines             ?    30767           
  Branches          ?        0           
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  Hits              ?     3465           
  Misses            ?    26839           
  Partials          ?      463

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