[Snyk] Upgrade dotenv from 8.2.0 to 8.6.0

[snyk-bot]

Snyk has created this PR to upgrade dotenv from 8.2.0 to 8.6.0.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 5 versions ahead of your current version.
• The recommended version was released 2 years ago, on 2021-05-05.

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