Bump async from 2.6.1 to 2.6.4 in /utils/hsts-prune#13

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dependabot/npm_and_yarn/utils/hsts-prune/async-2.6.4The-Periodic-Table-Of-Elements/https-everywhere:dependabot/npm_and_yarn/utils/hsts-prune/async-2.6.4Copy head branch name to clipboard