avoid use of `any` in logger.ts

packages/backend/src/logger.ts

@@ -19,7 +19,7 @@ type Context = {
 type Level = 'error' | 'success' | 'warning' | 'debug' | 'info';
 
 type Data = DataElement | DataElement[];
-type DataElement = Record<string, any> | string | null;
+type DataElement = Record<string, unknown> | Error | string | null;
 
 // eslint-disable-next-line import/no-default-export
 export default class Logger {