Update dependency dotenv to v12

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
dotenv	^11.0.0 -> ^12.0.0

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Release Notes

motdotla/dotenv

v12.0.0

Compare Source

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)

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[codecov]

Codecov Report

Merging #231 (4819eba) into master (af045db) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #231   +/-   ##
=======================================
  Coverage   91.66%   91.66%           
=======================================
  Files           7        7           
  Lines         144      144           
  Branches       39       39           
=======================================
  Hits          132      132           
  Misses         12       12           

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