[Snyk] Upgrade heap from 0.2.6 to 0.2.7

[snyk-bot]

Snyk has created this PR to upgrade heap from 0.2.6 to 0.2.7.

ℹ️ 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 1 version ahead of your current version.
• The recommended version was released a year ago, on 2021-12-02.

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