[Dev Deps] update @ljharb/eslint-config

Author: ljharb

package.json

@@ -29,7 +29,7 @@
 		"test:multirepo": "cd ./test/resolver/multirepo && npm install && npm test"
 	},
 	"devDependencies": {
-		"@ljharb/eslint-config": "^20.2.3",
+		"@ljharb/eslint-config": "^21.0.0",
 		"array.prototype.map": "^1.0.4",
 		"aud": "^2.0.0",
 		"copy-dir": "^1.3.0",