Bump cssnano from 5.1.15 to 7.1.0 in /frontend/packages/build#1329

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dependabot/npm_and_yarn/frontend/packages/build/main/cssnano-7.1.0filecoin-project/system-test-matrix:dependabot/npm_and_yarn/frontend/packages/build/main/cssnano-7.1.0Copy head branch name to clipboard