fix: regex for rpc endpoint

[alrevuelta]

Description

• The regex matching --rln-relay-eth-client-address flag was not allowing some valid RPC urls.
• Example, this should be valid http://foundry:8545
• But was failing:

Error while processing the rln-relay-eth-client-address=http://foundry:8545 parameter: Invalid HTTP RPC URL

• This PR fixes it so that it allows such URLs.

It can be also reproduced with:

docker run harbor.status.im/wakuorg/nwaku@sha256:d193792202726c51cd656c48f4ffd04f261ec2d8663a00591947a5aab3677dc5 --rln-relay-eth-client-address="http://foundry:3000"

Error while processing the rln-relay-eth-client-address=http://foundry:3000 parameter: Invalid HTTP RPC URL
Try wakunode2 --help for more information

[github-actions]

You can find the image built from this PR at

quay.io/wakuorg/nwaku-pr:2563-rln-v2-true

Built from 66ecce0

[rymnc]

regex reviews are tricky, but approving so I'm not a blocker.

[Ivansete-status]

LGTM! Thanks!
I just checked with another examples:

https://www.something.com/
http://www.something.com/
https://www.something.edu.co.in
http://www.url-with-path.com/path
https://www.url-with-querystring.com/?url=has-querystring
http://url-without-www-subdomain.com/
https://mail.google.com

[alrevuelta]

Thanks, merging since it is blocking, but we need unittests for this kind of thing.