chore(deps): update dependency @netlify/functions to v4

Author: renovate[bot]

packages/adapter-netlify/package.json

@@ -46,7 +46,7 @@
 		"set-cookie-parser": "^2.6.0"
 	},
 	"devDependencies": {
-		"@netlify/functions": "^3.0.0",
+		"@netlify/functions": "^4.0.0",
 		"@rollup/plugin-commonjs": "^28.0.1",
 		"@rollup/plugin-json": "^6.1.0",
 		"@rollup/plugin-node-resolve": "^16.0.0",