Update validator from ^10.0.0 to ^13.7.0 fixing ReDoS (CVE-2021-3765)

validator < 13.7.0 is vulnerable to a ReDoS attack (Regular Expression Denial of Service caused by Inefficient Regular Expression Complexity): https://nvd.nist.gov/vuln/detail/CVE-2021-3765

mod-graphql requires z-schema@3.21.0 requires validator@^10.0.0.