Remove usages of cross-fetch in backend packages

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

plugins/stack-overflow-backend/package.json

@@ -33,10 +33,10 @@
     "clean": "backstage-cli package clean"
   },
   "dependencies": {
-    "@backstage/plugin-search-common": "^1.0.1-next.0",
     "@backstage/config": "^1.0.1",
+    "@backstage/plugin-search-common": "^1.0.1-next.0",
+    "node-fetch": "^2.6.7",
     "qs": "^6.9.4",
-    "cross-fetch": "^3.1.5",
     "winston": "^3.2.1"
   },
   "files": [

plugins/stack-overflow-backend/src/search/StackOverflowQuestionsCollatorFactory.ts

@@ -20,7 +20,7 @@ import {
 } from '@backstage/plugin-search-common';
 import { Config } from '@backstage/config';
 import { Readable } from 'stream';
-import fetch from 'cross-fetch';
+import fetch from 'node-fetch';
 import qs from 'qs';
 import { Logger } from 'winston';