fix: install @types/node

This is why we've missed a few type errors.

Author: rowanmanning

jsconfig.json

@@ -2,6 +2,7 @@
 	"compilerOptions": {
 		"alwaysStrict": true,
 		"checkJs": true,
+		"maxNodeModuleJsDepth": 0,
 		"module": "commonjs",
 		"noEmit": true,
 		"noImplicitOverride": true,

package-lock.json

@@ -38,6 +38,7 @@
     "@commitlint/config-conventional": "^19.1.0",
     "@financial-times/eslint-config-next": "^7.1.0",
     "@types/jest": "^29.5.12",
+    "@types/node": "^20.12.7",
     "eslint": "^8.57.0",
     "eslint-plugin-jsdoc": "^48.2.1",
     "eslint-plugin-prettier": "^5.1.3",