[Snyk] Upgrade async from 2.6.3 to 2.6.4

[snyk-bot]

Snyk has created this PR to upgrade async from 2.6.3 to 2.6.4.

: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 1 version ahead of your current version.
• The recommended version was released 22 days ago, on 2022-04-13.

Release notes

Package name: async

• 2.6.4 - 2022-04-13

  Version 2.6.4

• 2.6.3 - 2019-07-14

  Version 2.6.3

from async GitHub release notes

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