Bump ajv and fsevents

Bumps [ajv](https://github.com/ajv-validator/ajv) to 6.12.6 and updates ancestor dependency [fsevents](https://github.com/fsevents/fsevents). These dependencies need to be updated together.


Updates `ajv` from 6.10.0 to 6.12.6
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](ajv-validator/ajv@v6.10.0...v6.12.6)

Updates `fsevents` from 1.1.2 to 1.2.13
- [Release notes](https://github.com/fsevents/fsevents/releases)
- [Commits](fsevents/fsevents@v1.1.2...v1.2.13)

---
updated-dependencies:
- dependency-name: ajv
  dependency-type: indirect
- dependency-name: fsevents
  dependency-type: direct:production
...

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

Author: dependabot[bot]