Update pallet weights to weights-v2

[1xstj]

The code base was upgraded to release 0.9.39, indicating that you are following the release pace consistently. However, you are still running weights v1 since the weights are still using the methods from_ref_time instead of the from_parts which involves the two fields from weights v2.

I recommend going through the following PR to migrate into Weights v2 properly:

paritytech/substrate#11637

You might also consider creating a weights template like this one to have more control over the weights process generation coming from the benchmarking.

From #569