Bump github.com/go-openapi/validate from 0.20.1 to 0.20.2 (#165)

Bumps [github.com/go-openapi/validate](https://github.com/go-openapi/validate) from 0.20.1 to 0.20.2.
- [Release notes](https://github.com/go-openapi/validate/releases)
- [Commits](https://github.com/go-openapi/validate/compare/v0.20.1...v0.20.2

)

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