[Snyk] Security upgrade python from 3-slim-stretch to 3.7-slim-stretch#23

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-938e9576ec85cbf4566a4f029aa934ba

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Commits on May 21, 2022

fix: _action_files/fastpages-nbdev.Dockerfile to reduce vulnerabilities
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