[Snyk] Security upgrade python from 3.11.0a5-alpine to 3.11.0a7-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

• aws-sam/Dockerfile

We recommend upgrading to python:3.11.0a7-alpine, as this image has only 1 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
	371	NULL Pointer Dereference SNYK-ALPINE315-KRB5-2432006	No Known Exploit
	511	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE315-LIBRETLS-2428776	No Known Exploit
	511	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE315-OPENSSL-2426331	No Known Exploit
	511	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE315-OPENSSL-2426331	No Known Exploit
	567	Out-of-bounds Write SNYK-ALPINE315-ZLIB-2434420	No Known Exploit

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