Array and string offset access syntax with curly braces is deprecated on excel upload in laraver ver- 5.4.36

I am using laravel version 5.4.36 and i am using this "maatwebsite/excel": "~2.1.0" library to access all the datas in sheet but this library is no longer supported for this version of framework can you help me how can i resolve this.

gettin this error - Array and string offset access syntax with curly braces is deprecated

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