Update dockerfile image location (#3746)

Author: kddejong

Dockerfile

@@ -1,6 +1,6 @@
-FROM python:3.13-alpine
+FROM public.ecr.aws/docker/library/python:3.12-alpine3.20
 
-RUN pip install cfn-lint
+RUN pip install cfn-lint[full]
 RUN pip install pydot
 
 ENTRYPOINT ["cfn-lint"]