Align on usage of cross-fetch vs node-fetch in frontend vs backend packages

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

plugins/auth-backend/package.json

@@ -42,7 +42,6 @@
     "compression": "^1.7.4",
     "cookie-parser": "^1.4.5",
     "cors": "^2.8.5",
-    "cross-fetch": "^3.0.6",
     "express": "^4.17.1",
     "express-promise-router": "^4.1.0",
     "express-session": "^1.17.1",
@@ -56,6 +55,7 @@
     "luxon": "^2.0.2",
     "minimatch": "^3.0.3",
     "morgan": "^1.10.0",
+    "node-fetch": "^2.6.1",
     "node-cache": "^5.1.2",
     "openid-client": "^4.2.1",
     "passport": "^0.4.1",