Bump ajv and table

Bumps [ajv](https://github.com/ajv-validator/ajv) and [table](https://github.com/gajus/table). These dependencies needed to be updated together.

Updates `ajv` from 4.11.8 to 6.12.6
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](ajv-validator/ajv@4.11.8...v6.12.6)

Updates `table` from 3.8.3 to 6.8.1
- [Release notes](https://github.com/gajus/table/releases)
- [Commits](gajus/table@v3.8.3...v6.8.1)

---
updated-dependencies:
- dependency-name: ajv
  dependency-type: indirect
- dependency-name: table
  dependency-type: indirect
...

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

Author: dependabot[bot]