0.87.0

Resolve prefetch-optimized nested connections on the event loop instead of
paying a sync_to_async thread hop per parent node: the nested-connection
default resolver, the queryset hook for prefetch-optimized querysets and
totalCount served from the prefetched window annotation no longer touch
the database, so they no longer need a worker thread.

This release was contributed by @rcybulski1122012 in #932

Additional contributors: @Copilot