Update dependency python-dotenv to ^0.20.0

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
python-dotenv	^0.19.0 -> ^0.20.0

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Release Notes

theskumar/python-dotenv

v0.20.0

Compare Source

Added

• Add encoding (Optional[str]) parameter to get_key, set_key and unset_key. (#​379 by [@​bbc2])

Fixed

• Use dict to specify the entry_points parameter of setuptools.setup (#​376 by [@​mgorny]).
• Don't build universal wheels (#​387 by [@​bbc2]).

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