[Snyk] Security upgrade ubuntu from trusty to trusty-20190515#7

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-0e923f7fa93e4b7012375e758a116a7c

+1-1

Commits on Oct 17, 2021

fix: vendor/golang.org/x/net/http2/Dockerfile to reduce vulnerabilities
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