Update dependency webpack-cli to v4.6.0

Editor assessment

Updating webpack-cli to v4.6.0 is stated exactly, with chore(deps) matching the maintenance bump in type and scope. The subject fully identifies the change, so no diff is needed to know what happened. There is no body, appropriate for a build-tooling version update, and no footers appear, none being owed. Hygiene is clean: imperative mood, no trailing period, short precise subject, no ticket junk, no pasted material. The message communicates everything a routine dependency update requires and refrains from anything that would distract, pad, or mislead.