fixed crps quantiles

[kashif]

set the quantiles to

quantiles = (jnp.arange(num_quantiles)/num_quantiles)[1:]

# [0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9]

to match the default implementations in gluonts evaluator (monash ts) and autogluon-time series