Update dependency @types/node-fetch to v2.6.13

Author: renovate[bot]

package-lock.json

@@ -25,7 +25,7 @@
     "@sourcegraph/tslint-config": "^12.3.1",
     "@types/express": "4.17.0",
     "@types/morgan": "1.9.9",
-    "@types/node-fetch": "2.6.10",
+    "@types/node-fetch": "2.6.13",
     "get-graphql-schema": "^2.1.1",
     "gql2ts": "^1.8.2",
     "prettier": "^1.16.0",