fix: add memoization to pkg_version_info to reduce cpu overhead
#4794
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Addresses resource overhead from repeated calls to
pkg_version_info. This function is called with only a handful of static strings, so it seems reasonable to just memoize the value indefinitely. The function is called in hot regions of the code, for example request json parsing and formatting when checking pydantic versions.Fixes #4784
No tests written, but seems like this should be covered by existing tests.