Update dependency async to 2.6.4 [SECURITY]

[renovate[bot]]

This PR contains the following updates:

Package	Change
async	2.6.3 -> 2.6.4

GitHub Vulnerability Alerts

CVE-2021-43138

A vulnerability exists in Async through 3.2.1 for 3.x and through 2.6.3 for 2.x (fixed in 3.2.2 and 2.6.4), which could let a malicious user obtain privileges via the mapValues() method.

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