[Snyk] Security upgrade python from 3.9.8-alpine to 3-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

• laradock/ipython/Dockerfile.controller

We recommend upgrading to python:3-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
	221	Integer Overflow or Wraparound SNYK-ALPINE314-EXPAT-2342147	No Known Exploit
	221	Integer Overflow or Wraparound SNYK-ALPINE314-EXPAT-2342148	No Known Exploit
	221	Integer Overflow or Wraparound SNYK-ALPINE314-EXPAT-2342152	No Known Exploit
	221	Integer Overflow or Wraparound SNYK-ALPINE314-EXPAT-2342153	No Known Exploit
	221	Integer Overflow or Wraparound SNYK-ALPINE314-EXPAT-2342154	No Known Exploit

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