Update pyyaml due to CVE-2017-18342

[unterstein]

While using k8s python client, we see this warning popping up in github:

CVE-2017-18342
high severity
Vulnerable versions: < 4.2b1
Patched version: 4.2b1
In PyYAML before 4.1, the yaml.load() API could execute arbitrary code. In other words, yaml.safe_load is not used.

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[yliaog]

https://nvd.nist.gov/vuln/detail/CVE-2017-18342#:~:text=CVE%2D2017%2D18342%20Detail&text=In%20PyYAML%20before%205.1%2C%20the,backward%20compatibility%20with%20the%20function.

says 5.1, instead of 4.2b1

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
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Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle stale

[fejta-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
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If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle rotten

[palnabarun]

/retest

[palnabarun]

/remove-lifecycle rotten

[palnabarun]

/lifecycle frozen

[palnabarun]

Thank you for raising this PR.

#1306 supersedes this. Hence, closing this PR.

[palnabarun]

/close

[k8s-ci-robot]

@palnabarun: Closed this PR.

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In response to this:

/close

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