Support Bitcoin 31.1

[satsfy]

Bitcoin 31.1 is out and corepc should support it. After a rough look, there doesn't seem to be any changes to corepc aside from an entry indicating we support the latest version.

[tcharding]

Niiice, that's a win.

[ANAMASGARD]

Sir @tcharding and @jamillambert I have raised the new PR as directed please review it thanks

PR LINK = https://git.rust-bitcoin.org/rust-bitcoin/corepc/pulls/671