[Snyk] Security upgrade @openzeppelin/contracts from 3.1.0 to 4.7.3#8

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-3b9855d61ed42962241e05bd47461031

+10-16

Commits on Aug 15, 2022

fix: package.json & package-lock.json to reduce vulnerabilities
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