[Snyk] Security upgrade @0x/subproviders from 4.1.2 to 6.0.8#614

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-c993ee7faeb68b6f0ce8d19c9ea499d4

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Commits on Dec 2, 2022

fix: packages/contractkit/package.json to reduce vulnerabilities
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