Update dependency python-dotenv to v0.21.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
python-dotenv	==0.20.0 -> ==0.21.0

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Release Notes

theskumar/python-dotenv

v0.21.0

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Added

• CLI: add support for invocations via 'python -m'. (#​395 by @​theskumar)
• load_dotenv function now returns False. (#​388 by @​larsks)
• CLI: add --format= option to list command. (#​407 by @​sammck)

Fixed

• Drop Python 3.5 and 3.6 and upgrade GA (#​393 by @​eggplants)
• Use open instead of io.open. (#​389 by @​rabinadk1)
• Improve documentation for variables without a value (#​390 by @​bbc2)
• Add parse_it to Related Projects by (#​410 by @​naorlivne)
• Update README.md by (#​415 by @​harveer07)
• Improve documentation with direct use of MkDocs by (#​398 by @​bbc2)

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