[Security] Bump acorn from 5.7.3 to 5.7.4 in /client

[dependabot-preview]

Bumps acorn from 5.7.3 to 5.7.4. This update includes a security fix.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects acorn, minimist, and svjsl There are high severity security vulnerabilities in two of ESLints dependencies: - acorn - minimist

The releases 1.8.3 and lower of svjsl (JSLib-npm) are vulnerable, but only if installed in a developer environment. A patch has been released (v1.8.4) which fixes these vulnerabilities.

Identifiers:

• CVE-2020-7598
• SNYK-JS-ACORN-559469 (doesn&Add index-graveyard page #39;t have a CVE identifier)

Affected versions: < 5.7.4

Commits

• 6370e90 Mark version 5.7.4
• fbc15b1 More rigorously check surrogate pairs in regexp validator
• See full diff in compare view

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