fix(s3-deployment): stop using deprecated API's that will cause breakage post 01/31/21

[iliapolo]

We currently use deprecated API's from the Lambda runtime that will be removed on January 30 2021.

This PR replaces those API usages with direct urllib usage, which is a built-in module available in any python installation.

Fixes #12219

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[gitpod-io]

[eladb]

Nice job!

[NetaNir]

Updated snapshot

[nija-at]

Nice!

Maybe change the title to something a bit better. Something like 'stop using deprecated botocore APIs'. The title as-is will make little sense to customers reading the changelog.

[iliapolo]

This integ test uses BucketDeployment, hence the asset changes.

aws-cdk/packages/@aws-cdk/aws-ecs/test/ec2/integ.environment-file.ts

Lines 48 to 52 in 54f0ac6

	const envFileDeployment = new s3deployment.BucketDeployment(stack, 'EnvFileDeployment', {
	destinationBucket: bucket,
	retainOnDelete: false,
	sources: [s3deployment.Source.asset(path.join(__dirname, '../demo-envfiles'))],
	});

[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

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