Update export_task.py

[Abinash23]

Description

Update the code to explicitly use UTF-8 encoding when reading from or writing to a file. This is necessary because the exported data from LabelBox contains Chinese/Japanese characters, and without proper encoding, it results in a UnicodeEncodeError.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• [ Update the code to explicitly use UTF-8 encoding when reading from or writing to a file. This is necessary because the exported data from LabelBox contains Chinese/Japanese characters, and without proper encoding, it results in a UnicodeEncodeError.] Bug fix (non-breaking change which fixes an issue)

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