Bump github.com/go-openapi/swag from 0.19.14 to 0.19.15 (#248)

Bumps [github.com/go-openapi/swag](https://github.com/go-openapi/swag) from 0.19.14 to 0.19.15.
- [Release notes](https://github.com/go-openapi/swag/releases)
- [Commits](https://github.com/go-openapi/swag/compare/v0.19.14...v0.19.15

)

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