chore: Update references to RLN contract address

[stubbsta]

Description

This PR is part of #3190, which requires that the RLN contract address is updated to the new contract address.
This PR needs to be merged with all other PRs related to #3190 as well as #3272

Changes

Contract address changed from 0xCB33Aa5B38d79E3D9Fa8B10afF38AA201399a7e3 to [0xB9cd878C90E49F797B4431fBF4fb333108CB90e6](https://sepolia.lineascan.build/address/0xB9cd878C90E49F797B4431fBF4fb333108CB90e6) in the following files:

• https://github.com/waku-org/nwaku/blob/master/apps/sonda/docker-compose.yml#L12
• https://github.com/waku-org/nwaku/blob/master/apps/sonda/register_rln.sh#L27
• https://github.com/waku-org/nwaku/blob/master/waku/factory/networks_config.nim#L25

How to test

This cannot be tested at this time.
The RLN tests in nwaku first need to be updated as well as the contract registration tools.

Issue closes

Part of closing #3190

[github-actions]

You can find the image built from this PR at

quay.io/wakuorg/nwaku-pr:3287

Built from a6f7e6b

[richard-ramos]

PR looks good.
I have a doubt: should we wait to merge this PR until the changes in the code required to work with this new contract are implemented?

[stubbsta]

I think we should wait, I plan to make another PR for the updated registration tool and any other related functionality.
This PR can then be merged at the same time as that one.

[jm-clius]

Indeed. LGTM, but since this change will break functionality until we have updated the code to use the new contract, this shouldn't be merged for now. Perhaps you can convert this to a Draft PR, which indicates work for which feedback can be given but that shouldn't be merged?