Increase PyYAML limit as awscli

[mbonfoster]

Should fix #441

Description of changes: This PR updates PyYAML limit in order to match with awscli. https://github.com/aws/aws-cli/pull/8037

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[ahmaze]

This is the related issue in pyyaml repo: https://github.com/yaml/pyyaml/issues/724

[mbonfoster]

@Mickeypeng any chance of reviewing/merging this PR?

[justinpincar]

Thank you for the fix! This issue is preventing us from deploying; would love to see this merged soon~

[Mickeypeng]

LGTM what do you think? @NihalM99

[chenrui333]

actually found a dependency conflict with docker-compose v1

relates to https://github.com/docker/compose/issues/9114

raise an issue, https://github.com/aws/aws-elastic-beanstalk-cli/issues/448

[mbonfoster]

@Mickeypeng @NihalM99 updates? I think that merging this PR will help many people that's having issues with deployment. Of course it's also necessary to check the conflict with docker-compose that @chenrui333 is mentioning, but merging this PR will help on many other cases.

[gabrielmontenegro-eye]

Thank you on this effort guys. Just reinforcing that this issue is also preventing us from deploying an important hotfix.

[Mickeypeng]

Seems like the test failed to run because it was from branch in another repo. Let me pull a new PR for testing, and then I will merge this one.

[Mickeypeng]

https://github.com/aws/aws-elastic-beanstalk-cli/pull/449 Same changes passed tests. Merging now