[Snyk] Security upgrade python from alpine to 3.11.0a5-alpine3.15

[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-alpine3.15, 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
	571	Integer Overflow or Wraparound SNYK-ALPINE315-EXPAT-2393733	No Known Exploit
	571	Integer Overflow or Wraparound SNYK-ALPINE315-EXPAT-2393735	No Known Exploit
	221	CVE-2021-3995 SNYK-ALPINE315-UTILLINUX-2393739	No Known Exploit
	221	CVE-2021-3996 SNYK-ALPINE315-UTILLINUX-2393741	No Known Exploit

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