[Snyk] Security upgrade @cosmjs/stargate from 0.27.1 to 0.28.6#7

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-d5e0dfaa29fedd8e91d4a2095d3c2e2d

+119-57

Commits on Jul 19, 2022

fix: packages/trestle/package.json & packages/trestle/yarn.lock to reduce vulnerabilities
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