Removing epoch_sampling_fraction does not support DatasetProcessingParams

[WenkelF]

We remove the epoch_sampling_fraction here:

graphium/graphium/data/datamodule.py

Lines 1957 to 1963 in b0d4fd5

	args = deepcopy(self.task_specific_args)
	# pop epoch_sampling_fraction out when creating hash
	# so that the data cache does not need to be regenerated
	# when epoch_sampling_fraction has changed.
	for task in self.task_specific_args.keys():
	if "epoch_sampling_fraction" in args[task].keys():
	args[task].pop("epoch_sampling_fraction")

However, args[task] is not always a Dict. For instance, in ADMETBenchmarkDataModule, it is a DatasetProcessingParams.