v1.1.0-rc2

Streaming RPC now works on every supported Julia. It was previously compiled out below
Julia 1.12, where streaming calls hung.

Fixes

Streaming is enabled on Julia 1.10 and 1.11. src/Streaming.jl is compiled on every
supported version and its testsets no longer carry a version guard (#68)
Fixed an end-of-stream race in the request pump. The pump un-paused libcurl and only
then closed the request stream, so a read callback landing in between paused the transfer
again with nothing left to resume it, and the call hung until its deadline. The handoff is
now a single critical section under the lock the callback already runs under
Worked around a libcurl bug in 8.4.0 and 8.5.0, where pausing a transfer's send
direction also stops its receive direction, which stalled streaming calls mid-stream on
Julia 1.10. Fixed upstream in libcurl 8.6.0
Worked around a libcurl bug in 8.6.0, where a socket event overwrites rather than adds
to a transfer's pending read interest, which stalled streaming calls at end of stream on
Julia 1.11. Fixed upstream in libcurl 8.7.0 (curl.se/bug/?i=12971)

Both libcurl workarounds are gated on the version actually loaded at run time, so a Julia
with a fixed libcurl pays nothing for them.

No performance change: per-message allocations are unchanged on every benchmark workload,
and throughput is within measurement noise

Carroll Vance
Sébastien Celles (@s-celles), who reported the hangs and
did the first diagnosis in #127