internal: Remove fetch polyfill for node as we only test 18+

Author: ntucker

package.json

@@ -84,7 +84,6 @@
     "core-js": "^3.40.0",
     "coveralls": "^3.1.0",
     "cpy-cli": "5.0.0",
-    "cross-fetch": "^4.0.0",
     "downlevel-dts": "^0.10.0",
     "eslint": "9.29.0",
     "globals": "^16.0.0",

scripts/testSetupNode.js

@@ -1 +0,0 @@
-require('cross-fetch/polyfill');

yarn.lock

@@ -11872,7 +11872,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"cross-fetch@npm:^4.0.0, cross-fetch@npm:^4.1.0":
+"cross-fetch@npm:^4.1.0":
   version: 4.1.0
   resolution: "cross-fetch@npm:4.1.0"
   dependencies:
@@ -26991,7 +26991,6 @@ __metadata:
     core-js: "npm:^3.40.0"
     coveralls: "npm:^3.1.0"
     cpy-cli: "npm:5.0.0"
-    cross-fetch: "npm:^4.0.0"
     downlevel-dts: "npm:^0.10.0"
     eslint: "npm:9.29.0"
     globals: "npm:^16.0.0"