Update public.ecr.aws/docker/library/python Docker tag to v3.12

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
public.ecr.aws/docker/library/python	final	minor	3.11-alpine -> 3.12-alpine
public.ecr.aws/docker/library/python	stage	minor	3.11-alpine -> 3.12-alpine

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