Revert "Bump @types/node-fetch from 2.5.12 to 3.0.3 (#3545)" (#3551)

This reverts commit a29e7f9.

Accidentally merged this before updating `node-fetch` itself,
which unfortunately cannot be done at this time due to a bug
in VS Code, so we need to revert this.

Author: andyleejordan

package-lock.json

@@ -58,7 +58,7 @@
     "@types/mocha": "~9.0.0",
     "@types/mock-fs": "~4.13.1",
     "@types/node": "~14.17.4",
-    "@types/node-fetch": "~3.0.3",
+    "@types/node-fetch": "~2.5.12",
     "@types/rewire": "~2.5.28",
     "@types/semver": "~7.3.8",
     "@types/sinon": "~10.0.2",