Bump cssnano from 5.1.15 to 7.0.6 in /frontend/packages/build#1228

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dependabot/npm_and_yarn/frontend/packages/build/main/cssnano-7.0.6filecoin-project/system-test-matrix:dependabot/npm_and_yarn/frontend/packages/build/main/cssnano-7.0.6Copy head branch name to clipboard