Use `.trionics.collapse_eg()` in `.deribit.api`

Commit this change separate from the (original) broader set applied to
the entire code base since the `.deribit.api` mod contained changes from
upstream max-pain work (from our very own @nt) which caused a noticeable
conflict and intros un-required changes from his work to re-enable
`deribit` support.

Note the original commit, "69eac7bb Spurious first-draft of EG
collapsing", applied similar changes through the rest of the code base.
AGAIN, this mod's change is only being broken out to minimize upstream
change conflicts due to updates to the `deribit` backend done earlier in
time-history.

piker/brokers/deribit/api.py

@@ -31,7 +31,7 @@ from typing import (
     Callable,
 )
 
-import pendulum
+from pendulum import now
 import trio
 from trio_typing import TaskStatus
 from rapidfuzz import process as fuzzy
@@ -39,6 +39,7 @@ import numpy as np
 from tractor.trionics import (
     broadcast_receiver,
     maybe_open_context
+    collapse_eg,
 )
 from tractor import to_asyncio
 # XXX WOOPS XD
@@ -432,6 +433,7 @@ async def get_client(
 ) -> Client:
 
     async with (
+        collapse_eg(),
         trio.open_nursery() as n,
         open_jsonrpc_session(
             _testnet_ws_url, dtype=JSONRPCResult) as json_rpc