Bump async from 2.6.3 to 2.6.4 in /skillmap (#8783)
Bump async from 2.6.3 to 2.6.4 in /skillmap (#8783)

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
Microsoft/pxt,Microsoft/pxt,Microsoft/pxt,Microsoft/pxt,Microsoft/pxt