[Snyk] Security upgrade python from 3.5.7-alpine to 3.8.18-alpine

[alikhil]

This PR was automatically created by Snyk using the credentials of a real user.

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

• Dockerfile

We recommend upgrading to python:3.8.18-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
	614	Out-of-bounds Read SNYK-ALPINE310-APKTOOLS-1246341	No Known Exploit
	714	Out-of-bounds Read SNYK-ALPINE310-APKTOOLS-1534688	No Known Exploit
	614	Improper Handling of Exceptional Conditions SNYK-ALPINE310-BUSYBOX-1090151	No Known Exploit
	614	Improper Handling of Exceptional Conditions SNYK-ALPINE310-BUSYBOX-1090151	No Known Exploit
	614	NULL Pointer Dereference SNYK-ALPINE310-OPENSSL-587954	No Known Exploit

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