repo task: enable pnpm audit

[shellscape]

• Rollup Plugin Name: all plugins
• Rollup Plugin Version: current

Expected Behavior / Situation

n/a

Actual Behavior / Situation

All plugins currently have a placeholder for the "security" script.

Modification Proposal

We need to enable use of pnpm audit. I'm not sure yet how this will work. pnpm may work on the main lockfile only, which would negate the need for the script in each plugin. It may operate on individual package.json files, but that's unlikely.

[pnevares]

I should be able to open a PR for this shortly, let me know if you'd prefer to handle it directly.