Bump openapi-sampler from 1.3.1 to 1.4.0

Bumps [openapi-sampler](https://github.com/APIs-guru/openapi-sampler) from 1.3.1 to 1.4.0.
- [Release notes](https://github.com/APIs-guru/openapi-sampler/releases)
- [Commits](https://github.com/APIs-guru/openapi-sampler/commits)

---
updated-dependencies:
- dependency-name: openapi-sampler
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>