Update dependency async to v3.2.4

This MR contains the following updates:

Package	Type	Update	Change
async (source)	overrides	patch	3.2.3 -> 3.2.4

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Release Notes

caolan/async

v3.2.4

Compare Source

• Fix a bug in priorityQueue where it didn't wait for the result. (#​1725)
• Fix a bug where unshiftAsync was included in priorityQueue. (#​1790)

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