Update dependency s3transfer to v0.5.2

This MR contains the following updates:

Package	Type	Update	Change
s3transfer	ironbank-pypi	minor	0.4.2 -> 0.5.2

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Release Notes

boto/s3transfer

v0.5.2

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• enhancement:s3: Added support for flexible checksums when uploading or downloading objects.

v0.5.1

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• enhancement:Python: Officially add Python 3.10 support

v0.5.0

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• feature:Python: Dropped support for Python 2.7

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