[Snyk] Security upgrade python from 3.6-alpine to 3.9.11-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

• Dockerfile

We recommend upgrading to python:3.9.11-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	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
	567	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE315-LIBRETLS-2428776	No Known Exploit
	567	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE315-OPENSSL-2426331	No Known Exploit
	567	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE315-OPENSSL-2426331	No Known Exploit

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