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0ede831a - [ty] Add hint that PEP 604 union syntax is only available in 3.10+ (#18192)

[ty] Add hint that PEP 604 union syntax is only available in 3.10+ (#18192) ## Summary Add a new diagnostic hint if you try to use PEP 604 `X | Y` union syntax in a non-type-expression before 3.10. closes https://github.com/astral-sh/ty/issues/437 ## Test Plan New snapshot test