update package license string to be spdx compatible

[altendky]

Using https://github.com/actions/dependency-review-action in https://github.com/Chia-Network/chia_rs/actions/runs/11807687782/job/32894842447?pr=785 I got an error stating that the existing license short text MIT/Apache-2.0/NCSA is invalid from an SPDX perspective.

Licenses
  Warning: 
  The validity of the licenses of the dependencies below could not be determined. Ensure that they are valid SPDX licenses:
  Cargo.lock » [email protected] – License: MIT/Apache-2.0/NCSA
  Error: Dependency review could not detect the validity of all licenses.

There was discussion with respect to Rust at rust-lang/cargo#2174 (comment) and there are SPDX examples at https://spdx.dev/learn/handling-license-info/.

[Manishearth]

Ugh, yeah. The old license was not clear, either, but I can confirm that (MIT OR Apache) AND NCSA is correct, and it matches what this crate has said in its readme for ages (The libfuzzer code is NCSA, everything else is MIT OR Apache as is standard for Rust)