Bump github.com/go-openapi/errors from 0.19.9 to 0.20.0 (#166)

Bumps [github.com/go-openapi/errors](https://github.com/go-openapi/errors) from 0.19.9 to 0.20.0.
- [Release notes](https://github.com/go-openapi/errors/releases)
- [Commits](https://github.com/go-openapi/errors/compare/v0.19.9...v0.20.0

)

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