candidate 1.2.0 release

[jgriffiths]

• Expose wally_tx_input_clone/wally_tx_input_clone_alloc
• Add support for python 3.12 now that it is released
• Update cibuildwheel and macos builder
• Use command -v as debian has deprecated which
• Update secp-zkp
• cmake improvements

[LeoComandini]

utACK 284e7aaad7aa38d63497b41bf354481d1da223e1, code review