Update to connexion 3

[stxue1]

This should resolve #4927 once common-workflow-language/workflow-service#136 is merged into workflow-service.

Changelog Entry

To be copied to the draft changelog by merger:

• Update to connexion 3

Reviewer Checklist

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    contrib/admin/test-pr otheruser theirbranchname issues/XXXX-fix-the-thing
    

  • If there is no associated issue, create one.
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Merger Checklist

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[adamnovak]

This looks pretty good, but I think we should keep using secure_path() if we can, and I don't see a good reason why we can't.

[adamnovak]

There might be encoding issues here if the temp directory has special characters in it, but they're not new to this PR.

[adamnovak]

I think this is good now.

[adamnovak]

wes-service 5.0 is on PyPI now so hopefully this passes.