[Snyk] Security upgrade python from 3.6-alpine to 3.9.13-alpine

[tibi-georgescu]

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-dev

We recommend upgrading to python:3.9.13-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	Integer Overflow or Wraparound SNYK-ALPINE315-EXPAT-2393733	No Known Exploit
	500	Integer Overflow or Wraparound SNYK-ALPINE315-EXPAT-2393735	No Known Exploit
	500	Integer Overflow or Wraparound SNYK-ALPINE315-EXPAT-2407738	No Known Exploit
	500	Improper Encoding or Escaping of Output SNYK-ALPINE315-EXPAT-2407749	No Known Exploit
	500	Exposure of Resource to Wrong Sphere SNYK-ALPINE315-EXPAT-2407753	No Known Exploit

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