[Snyk] Security upgrade alpine from 3.18 to 3.21.0#1

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Mecoli1219 wants to merge 1 commit intomasterfrom snyk-fix-4a07a9a9e5355e9c0d52e0cc2cf219b3

+1-1

Commits on Dec 12, 2024

fix: Dockerfile.flyteadmin to reduce vulnerabilities
snyk-bot
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