Bump is-my-json-valid from 2.15.0 to 2.20.5 in /consumer (#67)

Bumps [is-my-json-valid](https://github.com/mafintosh/is-my-json-valid) from 2.15.0 to 2.20.5.
- [Release notes](https://github.com/mafintosh/is-my-json-valid/releases)
- [Commits](mafintosh/is-my-json-valid@v2.15.0...v2.20.5)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]