Update OpenApi Generator to v4.1.3

[b1zzu]

Fixes: #336
Credits: @aeb-sia

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[brendandburns]

/lgtm
/approve

Thanks for the PR! I will use this to regenerate the code soon.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: b1zzu, brendandburns

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