Update all Python examples to use Docker v4

[scottslowe]

This is part of #1438.

All Python-based Pulumi programs that use the Docker provider need to be updated to use v4 of the Docker provider. This typically involves editing requirements.txt to use the updated provider version.

[rshade]

I looked thru all the projects containing pulumi-docker and this has been completed:

grep -lir pulumi-docker **/requirements.txt | xargs grep pulumi-docker
aws-py-django-voting-app/requirements.txt:pulumi-docker>=4.5.7,<4.6.0
aws-py-langserve/requirements.txt:pulumi-docker==4.5.8
aws-py-voting-app/requirements.txt:pulumi-docker>=4.5.7,<4.6.0
azure-py-appservice-docker/requirements.txt:pulumi-docker>=4.5.7,<4.6.0
azure-py-containerapps/requirements.txt:pulumi-docker>=4.5.7,<4.6.0
docker-py-multi-container-app/requirements.txt:pulumi-docker>=4.5.7,<4.6.0

[pulumi-bot]

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