[Snyk] Security upgrade golang from 1.15 to 1.21rc2#41

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cf-ci-bot wants to merge 1 commit intomasterfrom snyk-fix-e2d551062892b1d5b0478093dd6a04dc

+1-1

Commits on Jul 5, 2023

fix: vendor/github.com/newrelic/go-agent/internal/tools/utilization/Dockerfile to reduce vulnerabilities
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