[Snyk] Security upgrade python from 2-alpine to 3.11.0a2-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:3.11.0a2-alpine, as this image has only 11 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 Read SNYK-ALPINE311-APKTOOLS-1534687	No Known Exploit
	500	Buffer Overflow SNYK-ALPINE311-OPENSSL-1569451	No Known Exploit
	500	Buffer Overflow SNYK-ALPINE311-OPENSSL-1569451	No Known Exploit
	400	NULL Pointer Dereference SNYK-ALPINE311-OPENSSL-587980	No Known Exploit
	400	Improper Initialization SNYK-ALPINE311-SQLITE-587424	No Known Exploit

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