Increase pytest CI timeout (#1196)

Rather than individual tests hanging, the primary nightly problem seems to be that the `pytest` timeout is too short, increase it by 10 minutes to check if that is sufficient.

Authors:
   - Peter Andreas Entschev (https://github.com/pentschev)

Approvers:
   - Ray Douglass (https://github.com/raydouglass)

ci/test_python.sh

@@ -45,7 +45,7 @@ DASK_CUDA_WAIT_WORKERS_MIN_TIMEOUT=20 \
 UCXPY_IFNAME=eth0 \
 UCX_WARN_UNUSED_ENV_VARS=n \
 UCX_MEMTYPE_CACHE=n \
-timeout 30m pytest \
+timeout 40m pytest \
   -vv \
   --capture=no \
   --cache-clear \