[Snyk] Upgrade solc from 0.7.1 to 0.8.6#18

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-473c9a4d76323eb8696db0464eff89c4

+1-1

Commits on Sep 7, 2021

fix: upgrade solc from 0.7.1 to 0.8.6
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