build(deps-dev): bump ajv from 7.0.2 to 7.0.3
build(deps-dev): bump ajv from 7.0.2 to 7.0.3

Bumps [ajv](https://github.com/ajv-validator/ajv) from 7.0.2 to 7.0.3.
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](https://github.com/ajv-validator/ajv/compare/v7.0.2...v7.0.3)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
lgrammel/vega,vega/vega,vega/vega,vega/vega,vega/vega