Currently the CI fails to compile `zerocopy` due to a rustc issue: https://github.com/rust-lang/rust/issues/144168 As a temporary solution we should pin the rustc version to a known working commit and revert it once the issue is fixed. --- Failed CI runs: - https://github.com/RustPython/RustPython/actions/runs/16384359032/job/46301444119 - https://github.com/RustPython/RustPython/actions/runs/16386583040/job/46306948881