[Snyk] Security upgrade alpine from 3.15.6 to 3.21.3#406

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LadyK-21 wants to merge 1 commit intomasterfrom snyk-fix-7f1f4a7941310f53215c7a40afb8a9ef

+1-1

Commits on Feb 18, 2025

fix: projects/examples/services/sleeper/Dockerfile to reduce vulnerabilities
snyk-bot
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