[Snyk] Security upgrade alpine from 3.18.0 to 3.21.2#622

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ksatchit wants to merge 1 commit intomasterfrom snyk-fix-0b75d9f0e8ee66af5d2d4a8cba289ce5

+1-1

Commits on Jan 12, 2025

fix: custom/litmus-checker/Dockerfile to reduce vulnerabilities
snyk-bot
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