Update snakeyaml to 2.0

[scala-steward]

Updates org.yaml:snakeyaml from 1.33 to 2.0.
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Adjust future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "org.yaml", artifactId = "snakeyaml" } ]

Or, add this to slow down future updates of this dependency:

dependencyOverrides = [{
  pullRequests = { frequency = "30 days" },
  dependency = { groupId = "org.yaml", artifactId = "snakeyaml" }
}]

labels: library-update, commit-count:1

[mziolekda]

Fixes #356

[zmccoy]

Merging this to get the version upgrade into #357