Bump github.com/go-openapi/strfmt from 0.20.0 to 0.20.1

Bumps [github.com/go-openapi/strfmt](https://github.com/go-openapi/strfmt) from 0.20.0 to 0.20.1.
- [Release notes](https://github.com/go-openapi/strfmt/releases)
- [Commits](https://github.com/go-openapi/strfmt/compare/v0.20.0...v0.20.1

)

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