[Snyk] Security upgrade golang from 1.6 to 1.15#1

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-6c90da68ed78e99a611ab09fd6cf0973

+1-1

Commits on Mar 25, 2021

fix: stable/rethinkdb/init/rethinkdb-probe/Dockerfile.build to reduce vulnerabilities
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