deps: bump ajv from 6.11.0 to 6.12.6 (#1129)
deps: bump ajv from 6.11.0 to 6.12.6 (#1129)

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
ctavan/express-validator,ctavan/express-validator