rustpython-compiler-core pulls in std transitively via its dependencies #9256

This crate is marked #![no_std]:

But some of its dependencies do not support no_std and pull in std transitively:

• malachite-bigint (version 0.14.0):

  RustPython/crates/compiler-core/Cargo.toml

  Line 19 in 657bab3

  malachite-bigint = { workspace = true }

• rustpython-ruff_source_file (version 0.17.1):

  RustPython/crates/compiler-core/Cargo.toml

  Line 13 in 657bab3

  ruff_source_file = { workspace = true }

As a result, builds targeting bare-metal or other no_std-only targets fail to compile, even though the crate itself contains no direct std usage.