[Snyk] Security upgrade python from 3-alpine3.13 to 3.11.0a5-slim-bullseye

[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:3.11.0a5-slim-bullseye, as this image has only 48 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-ALPINE313-EXPAT-2406625	No Known Exploit
	500	Integer Overflow or Wraparound SNYK-ALPINE313-EXPAT-2406626	No Known Exploit
	500	Improper Encoding or Escaping of Output SNYK-ALPINE313-EXPAT-2407739	No Known Exploit
	500	Exposure of Resource to Wrong Sphere SNYK-ALPINE313-EXPAT-2407752	No Known Exploit
	500	Integer Overflow or Wraparound SNYK-ALPINE313-EXPAT-2407757	No Known Exploit

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