Bump github.com/go-openapi/spec from 0.20.1 to 0.20.3 (#164)

* Bump github.com/go-openapi/spec from 0.20.1 to 0.20.3

Bumps [github.com/go-openapi/spec](https://github.com/go-openapi/spec) from 0.20.1 to 0.20.3.
- [Release notes](https://github.com/go-openapi/spec/releases)
- [Commits](https://github.com/go-openapi/spec/compare/v0.20.1...v0.20.3

)

Signed-off-by: dependabot[bot] <support@github.com>

* update go.sum

Signed-off-by: Bob Callaway <bcallawa@redhat.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Luke Hinds <7058938+lukehinds@users.noreply.github.com>
Co-authored-by: Bob Callaway <bcallawa@redhat.com>