Reduce pytest concurrency to reduce the queuing risk (#2926)

Reduce pytest concurrency from 48 to 36

Author: sfc-gh-yzou

tox.ini

@@ -50,8 +50,8 @@ setenv =
     COVERAGE_FILE = {env:COVERAGE_FILE:{toxworkdir}/.coverage.{envname}}
     ci: SNOWFLAKE_PYTEST_VERBOSITY = -vvv
     # Do not run doctests in parallel so coverage works
-    # Snowpark uses 48 workers to accelerate testing in merge gate
-    !doctest: SNOWFLAKE_PYTEST_PARALLELISM = -n 48
+    # Snowpark uses 36 workers to accelerate testing in merge gate
+    !doctest: SNOWFLAKE_PYTEST_PARALLELISM = -n 36
     # Snowpark uses 4 workers for daily testing since some of its test jobs use weak MacOS instances.
     !doctest: SNOWFLAKE_PYTEST_DAILY_PARALLELISM = -n 6
     # Set test type, either notset, unit, integ, or both