fix: type hint was wrong type in dx data generator

Better type hinting support means this was now actually triggering an error. However, it is currently returning numpy types, which is a bug in core. Initial random.seed(seed) now prints this error, and is expected to be fixed in next release.

> DeprecationWarning: Seeding based on hashing is deprecated
since Python 3.9 and will be removed in a subsequent version. The only
supported seed types are: None, int, float, str, bytes, and bytearray.

See: deephaven/deephaven-core#4933

plugins/plotly-express/src/deephaven/plot/express/data/data_generators.py

@@ -178,7 +178,7 @@ def random_list_sym(seed: int) -> str:
  def random_list_exchange(seed: int) -> str:
  return random.choices(exchange, exchange_weights)[0]
 
- def random_trade_size(rand: int) -> int:
+ def random_trade_size(rand: float) -> int:
  """
  Random distribution of trade size, approximately mirroring market data
  """