Remove npm audit whitelisted package - Acorn

[sareh]

Is your feature request related to a problem? Please describe.
In #5811 we added acorn to the audit-ci whitelist, since other dependencies of ours need to include the updated acorn dependency.

We should remove the --whitelist acorn from the script.

Describe the solution you'd like
After these PRs that should patch the vulnerabilities:

• jsdom: Update packages jsdom/jsdom#2885 ✅
• webpack-bundle-analyzer: Update some dependencies to get rid of vulnerability warnings webpack-contrib/webpack-bundle-analyzer#339 ✅
• webpack: Update package.json webpack/webpack#10518 ✅

We should update our dependencies and remove the whitelist.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Testing notes
[Tester to complete]

Dev insight: Will Cypress tests be required or are unit tests sufficient? Will there be any potential regression? etc

• This feature is expected to need manual testing.

Additional context
Add any other context or screenshots about the feature request here.

[mulholo]

Webpack bundle analyzer done for you! webpack-contrib/webpack-bundle-analyzer#339

[FK78]

Webpack has patched the vulnerability: https://github.com/webpack/webpack/releases/tag/v4.42.1