Update `pydantic` dependency for `ray>2.9`

[garrettwrong]

When Ray 2.9 is released across all relevant platforms we can consider requiring ray>2.9 and updating/removing the pydantic dependency. We do not use pydantic directly in ASPIRE.

See:

ray-project/ray#37019

Tentatively adding to v0.13.0 board. For v0.12.1 we are going with the workaround recommended by Ray devs at this time via #1065 .

[garrettwrong]

Looks like ray is at 2.9.2 now. I'll prep a PR that update ray and pydantic versions.

[garrettwrong]

Ray has been updated in #1092, closing.