Bump github.com/go-openapi/strfmt from 0.21.1 to 0.21.2 (#656)

Bumps [github.com/go-openapi/strfmt](https://github.com/go-openapi/strfmt) from 0.21.1 to 0.21.2.
- [Release notes](https://github.com/go-openapi/strfmt/releases)
- [Commits](https://github.com/go-openapi/strfmt/compare/v0.21.1...v0.21.2

)

---
updated-dependencies:
- dependency-name: github.com/go-openapi/strfmt
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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