Update dependency dotenv to v12

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
dotenv	10.0.0 -> 12.0.4

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Release Notes

motdotla/dotenv (dotenv)

v12.0.4

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Changed

• README updates
• Minor order adjustment to package json format

v12.0.3

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Changed

• Simplified jsdoc for consistency across editors

v12.0.2

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Changed

• Improve embedded jsdoc type documentation

v12.0.1

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Changed

• README updates and clarifications

v12.0.0

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Removed

• Breaking: drop support for Flow static type checker (#​584)

Changed

• Move types/index.d.ts to lib/main.d.ts (#​585)
• Typescript cleanup (#​587)
• Explicit typescript inclusion in package.json (#​566)

v11.0.0

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Changed

• Breaking: drop support for Node v10 (#​558)
• Patch debug option (#​550)

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