fix: use legacy config

package.json

@@ -41,7 +41,7 @@
     "test": "jest --runInBand --verbose",
     "test:coverage": "yarn test --coverage",
     "test:ci": "yarn test:coverage --reporters=default jest-junit --coverageReporters lcov --coverageReporters cobertura",
-    "lint": "eslint \"**/*.ts\"",
+    "lint": "ESLINT_USE_FLAT_CONFIG=false eslint \"**/*.ts\"",
     "types": "tsc",
     "semantic-release": "semantic-release"
   },