security: fixes GraphQL DoS vulnerability. query depth limit + graphql-go v1.3.0 → v1.9.0#18

chris-mercer wants to merge 2 commits intoethereumclassic:masterethereumclassic/core-geth:masterfrom

chris-mercer:security/graphql-depth-limitchris-mercer/core-geth:security/graphql-depth-limitCopy head branch name to clipboard