[Snyk] Security upgrade ubuntu from 16.04 to xenial-20201014#2

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paavaanan wants to merge 1 commit intomasterfrom

snyk-fix-2b2cb2f651708f14efa2bcb53aca72d5

Commits on Jul 11, 2024

fix: dockers/docker-sonic-mgmt/Dockerfile.j2 to reduce vulnerabilities
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