[Snyk] Security upgrade python from 3.5-alpine to 3.9.8-alpine

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• ipython/Dockerfile.engine

We recommend upgrading to python:3.9.8-alpine, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	500	Out-of-bounds Read SNYK-ALPINE312-APKTOOLS-1533753	No Known Exploit
	471	Out-of-bounds Write SNYK-ALPINE312-NCURSES-2313024	No Known Exploit
	471	Out-of-bounds Write SNYK-ALPINE312-NCURSES-2313024	No Known Exploit
	500	Buffer Overflow SNYK-ALPINE312-OPENSSL-1569452	No Known Exploit
	500	Buffer Overflow SNYK-ALPINE312-OPENSSL-1569452	No Known Exploit

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