Replace deprecated League\Csv createFrom* methods with AbstractCsv::from / fromString

Sachin Kharelrequested to merge
issue/csv_serialization-3562555:sachinkharel-8.x-2.x-patch-be56 into 8.x-2.x

Fixes deprecation warnings starting in league/csv 9.27.x by replacing deprecated createFromString and createFromFileObject with AbstractCsv::from and AbstractCsv::fromString.

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