pop new: Use latest paritytech templates

[kianenigma]

As per paritytech/polkadot-sdk#3155 outcome :)

[AlexD10S]

Thanks for sharing. We can definitely update the tool to support the new parachain template for now: https://github.com/paritytech/polkadot-sdk-parachain-template. We don't have any other solo-chain templates, so we'll need to think about how to support solo chains.

[kianenigma]

Just focusing on the parachain one sounds reasonable. We will also put most of our efforts into that in the future.

[AlexD10S]

@kianenigma Thanks for the suggestion. We've integrated the new parachain template. If you'd like to test it before we merge it: #297.