[Snyk] Security upgrade grunt-contrib-cssmin from 0.14.0 to 1.0.0#18

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snyk-bot wants to merge 1 commit intodevelfrom snyk-fix-56e9ac1bbb028b67992c1141c9999dbe

Commits on May 31, 2021

fix: public/assets/vendor/footable/package.json to reduce vulnerabilities
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