Previously, the EVM integration imposed a maximum transfer limit of 18.4 TAO to avoid precision loss when converting between EVM (18 decimals) and Substrate (9 decimals).

This update removes the transfer limit by truncating excess decimals from the least significant end during the conversion. As a result, large transfers are now allowed. Infinitesimally small amounts of WEI (less than the precision of TAO) are discarded during this process, and a log entry is generated whenever such precision loss occurs.

also includes some CI fixes:

• cargo audit version locked for now to prevent regressions of the Cargo.lock parsing issue
• don't need to install rustup because it is pre-installed with stable already installed