[Snyk] Security upgrade python from 3.7-alpine to 3.12.0a5-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:3.12.0a5-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	CVE-2023-0286 SNYK-ALPINE317-OPENSSL-3314651	No Known Exploit
	221	CVE-2022-4450 SNYK-ALPINE317-OPENSSL-3314657	No Known Exploit
	221	CVE-2023-0216 SNYK-ALPINE317-OPENSSL-3314658	No Known Exploit
	221	CVE-2022-4304 SNYK-ALPINE317-OPENSSL-3314659	No Known Exploit
	221	CVE-2023-0217 SNYK-ALPINE317-OPENSSL-3314660	No Known Exploit

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