[Snyk] Security upgrade ruby from 2.6-slim to 2.7.8-slim#179

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snyk-bot wants to merge 1 commit intomainfrom snyk-fix-2b963f7f6c517377f043765f38f5523b

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Commits on Mar 31, 2023

fix: code-samples/serving/hello-world/helloworld-ruby/Dockerfile to reduce vulnerabilities
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