Fix for RLIMIT patch (#12882)

Implement new soft limit introduced by https://github.com/ray-project/ray/pull/12853.

python/ray/worker.py

@@ -614,7 +614,7 @@ def init(
             logger.debug("Automatically increasing RLIMIT_NOFILE to max "
                          "value of {}".format(hard))
             try:
-                resource.setrlimit(resource.RLIMIT_NOFILE, (hard, hard))
+                resource.setrlimit(resource.RLIMIT_NOFILE, (soft, hard))
             except ValueError:
                 logger.debug("Failed to raise limit.")
         soft, _ = resource.getrlimit(resource.RLIMIT_NOFILE)