[Snyk] Security upgrade python from 3.6-slim-buster to 3.11.0a5-slim-buster

[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-buster, as this image has only 81 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-DEBIAN10-EXPAT-2359258	No Known Exploit
	500	Integer Overflow or Wraparound SNYK-DEBIAN10-EXPAT-2384929	No Known Exploit
	500	Improper Encoding or Escaping of Output SNYK-DEBIAN10-EXPAT-2403513	No Known Exploit
	500	Exposure of Resource to Wrong Sphere SNYK-DEBIAN10-EXPAT-2403518	No Known Exploit
	500	Integer Overflow or Wraparound SNYK-DEBIAN10-EXPAT-2406128	No Known Exploit

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[mcdonnnj]

We only use stable releases of Python.