Update dependency copy-webpack-plugin to v12#8

mend-for-github-com[bot] wants to merge 1 commit intomainspotfiresoftware/spotfire-mod-scatterplotmatrix:mainfrom

whitesource-remediate/copy-webpack-plugin-12.xspotfiresoftware/spotfire-mod-scatterplotmatrix:whitesource-remediate/copy-webpack-plugin-12.xCopy head branch name to clipboard