Bump lodash and @stoplight/spectral (#297)

Bumps [lodash](https://github.com/lodash/lodash) to 4.17.21 and updates ancestor dependency [@stoplight/spectral](https://github.com/stoplightio/spectral). These dependencies need to be updated together.


Updates `lodash` from 4.17.19 to 4.17.21
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.19...4.17.21)

Updates `@stoplight/spectral` from 5.7.1 to 5.9.2
- [Release notes](https://github.com/stoplightio/spectral/releases)
- [Changelog](https://github.com/stoplightio/spectral/blob/v5.9.2/CHANGELOG.md)
- [Commits](stoplightio/spectral@v5.7.1...v5.9.2)

---
updated-dependencies:
- dependency-name: lodash
  dependency-type: indirect
- dependency-name: "@stoplight/spectral"
  dependency-type: direct:production
...

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Author: dependabot[bot]