[FEATURE] Compatibility with pyyaml 6.0

[jakeberesford-palmetto]

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• Consider adding a unit test if your PR resolves an issue.

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What does this implement/fix? Explain your changes.

dbt-core now depends on pyyaml 6.0, we want to make sure folks can install palm-dbt in an environment where they are running dbt on the metal. The good news is we just have to remove the version pin. All our yaml.load calls specify the loader

Does this close any currently open issues?

…

Any other comments?

This change will need to be deployed along with a corresponding patch in palm cli (palmetto/palm-cli#96)

[mariahjrogers]

this hit everyone this week huh 😅

[jakeberesford-palmetto]

this hit everyone this week huh 😅

Thankfully we're using Loader everywhere we use yaml.load so the changeset was small.