[Snyk] Security upgrade postcss-css-variables from 0.8.1 to 0.18.0#18

snyk-bot wants to merge 1 commit intomasterdebtcollective/dc-vue-header:masterfrom

snyk-fix-6897d66e63c717a7b27b4b8770d97627debtcollective/dc-vue-header:snyk-fix-6897d66e63c717a7b27b4b8770d97627Copy head branch name to clipboard