[v2] Bump ruamel-yaml from 0.17.21 to 0.18.16

[tkelman]

This is a combination of #9811 and the test data format updates from #8072. Updating ruamel-yaml is necessary for Python 3.14 support #9783. ~~I may be missing regeneration of a few more lockfiles, not sure what the procedure is for updating all of those.~~ I updated them by hand, hopefully same result as running the regenerate lockfiles script

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