fix: package.json & package-lock.json to reduce vulnerabilities (#58)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-VALIDATOR-1090599
- https://snyk.io/vuln/SNYK-JS-VALIDATOR-1090600
- https://snyk.io/vuln/SNYK-JS-VALIDATOR-1090601
- https://snyk.io/vuln/SNYK-JS-VALIDATOR-1090602

Author: snyk-bot

package-lock.json

@@ -40,7 +40,7 @@
   "dependencies": {
     "@graphql-tools/schema": "^6.0.9",
     "@graphql-tools/utils": "^6.0.9",
-    "validator": "^10.2.0"
+    "validator": "^13.6.0"
   },
   "peerDependencies": {
     "graphql": "^14.0.0 || ^15.0.0"