[Snyk] Security upgrade @slack/bolt from 3.9.0 to 3.15.0#185

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connorads wants to merge 1 commit intomasterfrom snyk-fix-9770790134f57d382020dcd88488aa03

+124-51

Commits on Dec 27, 2023

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