[Snyk] Security upgrade python from 3.6.7-alpine to 3.11.0rc1-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:3.11.0rc1-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	Out-of-bounds Write SNYK-ALPINE38-BZIP2-452633	No Known Exploit
	500	Out-of-bounds Write SNYK-ALPINE38-MUSL-458276	No Known Exploit
	500	Out-of-bounds Write SNYK-ALPINE38-MUSL-458276	No Known Exploit
	500	Out-of-bounds Read SNYK-ALPINE38-SQLITE-458494	No Known Exploit
	400	Improper Initialization SNYK-ALPINE38-SQLITE-598534	No Known Exploit

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