feat: switch to the sepolia testnet (#4465)

[mrekucci]

Checklist

• I have read the coding guide.
• My change requires a documentation update, and I have done it.
• I have added tests to cover my changes.
• I have filled out the description and linked the related issues.

Description

Switch from the Goerli testnet to the Sepolia testnet.

Closes #3949

[istae]

here we are using an -rc tag, is this safe to be merged to master and released?

[0xCardinalError]

RC is because the actual release is still on goerli as when you built nodes so far you used it and If sepolia was in release then you would have problem. If we are ready I can add it to official release also and different TAG can be used.

[acha-bill]

If we are going to merge this to master then we probably shouldn't be using RCs

[0xCardinalError]

Not a problem, here is non-RC release

https://github.com/ethersphere/go-storage-incentives-abi/tree/v0.6.2

[notanatol]

lgtm but there's a lot of mentions of 'goerli' in various places, maybe this is a good place to update them.

[janos]

I agree with @notanatol about the goerli mentions in the codebase. And it is better to keep the practice not to merge to master rc versions, even if it is for the testnet only.

[0xCardinalError]

lgtm but there's a lot of mentions of 'goerli' in various places, maybe this is a good place to update them.

please someone do that for Bee node.
in storage incentives repo I removed all goerli mentions