bump node-fetch and cross-fetch

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

plugins/techdocs-backend/package.json

@@ -41,14 +41,14 @@
     "@backstage/search-common": "^0.2.2",
     "@backstage/techdocs-common": "^0.11.7",
     "@types/express": "^4.17.6",
-    "cross-fetch": "^3.0.6",
+    "cross-fetch": "^3.1.5",
     "dockerode": "^3.3.1",
     "express": "^4.17.1",
     "express-promise-router": "^4.1.0",
     "fs-extra": "9.1.0",
     "knex": "^1.0.2",
     "lodash": "^4.17.21",
-    "node-fetch": "^2.6.1",
+    "node-fetch": "^2.6.7",
     "p-limit": "^3.1.0",
     "winston": "^3.2.1"
   },