[Snyk] Security upgrade @slack/client from 4.2.2 to 4.5.0#38

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snyk-bot wants to merge 1 commit intottrc-teams-mgh-v69-02-01from snyk-fix-a779556d5e787d5057af8a51b71c835a

+409-400

Commits on May 25, 2021

fix: package.json & package-lock.json to reduce vulnerabilities
snyk-bot
committed