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st_keys = pulumi.Output.all(rg.resource_group_name, st.name).apply(
    lambda args: storage.list_storage_account_keys(
        resource_group_name=args[0],
        account_name=args[1]
    )
)

or

st_keys = pulumi.Output.all(rg_name=rg.resource_group_name, st_name=st.name).apply(
    lambda args: storage.list_storage_account_keys(
        resource_group_name=args['rg_name'],
        account_name=args['st_name']
    )
)

ok I see

thx @witty-candle-66007 I ended up using

arg[0]...

for some IAM policies and it doesn't read well Using the dictionary makes it so much easier to read and understand