Investigate updating to encoding/json/v2

[gmlewis]

This involves checking if Go 1.25 ("oldstable") is supported (I think so, but please check).

This is a great issue for anyone new to Go or to this repo.
See CONTRIBUTING.md for details, and thank you in advance for your contributions!

[merchantmoh-debug]

@Not-Dhananjay-Mishra @alexandear > Thoughts?

[munlicode]

Hey! I would like to work on this issue.

[gmlewis]

Hey! I would like to work on this issue.

Thank you, @munlicode! It's yours.

[stevehipwell]

@gmlewis isn't the API for this still unstable in v1.26? I know discussions are still ongoing and that there isn't a guarantee that it makes it into v1.27 as stable.

You can ignore this, I missed the purpose.