setup.py: change pyyaml requirement to >= 6?

[concretevitamin]

That said, the dependency issue may occur for folks who already have newer version of kubernetes installed. As suggested in review comment, can you also try pyyaml >=6.0.1?

Originally posted by @romilbhardwaj in #2283 (review)

Pinning pyyaml<=5.3.1 was a temp fix. We should test pinning it to be >= 6 or the like

• Unable to install aws-cli via pip - package dependency broke aws/aws-cli#8036 (comment)
• Request for a v5.4.1.post1 release to set Cython<3  yaml/pyyaml#728
• Minor: require pyyaml > 3.13 to avoid an error. #2283 (comment)

[jmif]

Running into this with https://github.com/mosaicml/composer, would be great to support 6.0+. Is upgrading + running tests sufficient or is there more testing work required? May be able to help here.

[concretevitamin]

We'd love your help to test 6.0+ @jmif! Please see here: https://github.com/skypilot-org/skypilot/blob/master/CONTRIBUTING.md#testing

[github-actions]

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[romilbhardwaj]

We now use pyyaml > 3.13, != 5.4.* as the constraint. Closing.