Remove `spawn_blocking` from version map (#1966)
I previously add `spawn_blocking` to the version map construction as it
had become a bottleneck
(https://github.com/astral-sh/uv/pull/1163/files#diff-704ceeaedada99f90369eac535713ec82e19550bff166cd44745d7277ecae527R116).
With the zero copy deserialization, this has become so fast we don't
need to move it to the thread pool anymore. I've also checked
`DataWithCachePolicy` but it seems to still take a significant amount of
time. Span visualization:
Resolving jupyter warm:
Resolving jupyter cold:
I've also updated the instrumentation a little.
We don't seem cpu bound for the cold cache (top) and refresh case
(bottom) from jupyter:
