Update dependency requests to v2.28.1

This MR contains the following updates:

Package	Update	Change
requests (source, changelog)	patch	==2.28.0 -> ==2.28.1

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Release Notes

psf/requests

v2.28.1

Compare Source

Improvements

• Speed optimization in iter_content with transition to yield from. (#​6170)

Dependencies

• Added support for chardet 5.0.0 (#​6179)
• Added support for charset-normalizer 2.1.0 (#​6169)

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