Update dependency dotenv to v16

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
dotenv	^15.0.0 -> ^16.0.0

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Release Notes

motdotla/dotenv

v16.0.0

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Added

• Breaking: Backtick support 🎉 (#​615)

If you had values containing the backtick character, please quote those values with either single or double quotes.

v15.0.1

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Changed

• Properly parse empty single or double quoted values 🐞 (#​614)

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