python-bcrypt: update to version 5.0.0

[BKPepe]

Release notes:
https://github.com/pyca/bcrypt/releases/tag/5.0.0

This should hopefully fix the buildbot failure:

  --- stderr
  error: the configured Python interpreter version (3.13) is newer than PyO3's maximum supported version (3.12)
  = help: please check if an updated version of PyO3 is available. Current version: 0.21.2
  = help: set PYO3_USE_ABI3_FORWARD_COMPATIBILITY=1 to suppress this check and build anyway using the stable ABI
warning: build failed, waiting for other jobs to finish...
<string>:58: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.

    =============================DEBUG ASSISTANCE=============================
    If you are seeing a compilation error please try the following steps to
    successfully install bcrypt:
    1) Upgrade to the latest pip and try again. This will fix errors for most
       users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip
    2) Ensure you have a recent Rust toolchain installed. bcrypt requires
       rustc >= 1.64.0. (1.63 may be used by setting the BCRYPT_ALLOW_RUST_163
       environment variable)
    
    Python: 3.13.9
    platform: Linux-6.1.0-26-amd64-x86_64-with-glibc2.31
    pip: 25.2
    setuptools: 80.9.0
    setuptools_rust: 1.12.0
    rustc: 1.90.0 (1159e78c4 2025-09-14) (built from a source tarball)
    =============================DEBUG ASSISTANCE=============================
    
error: `cargo rustc --lib --message-format=json-render-diagnostics --manifest-path src/_bcrypt/Cargo.toml --target aarch64-unknown-linux-musl -v --features pyo3/extension-module --profile release --crate-type cdylib --` failed with code 101

[Copilot]

Pull request overview

This PR updates the python-bcrypt package from version 4.1.3 to 5.0.0 to resolve a buildbot failure caused by Python 3.13 incompatibility. The older version used PyO3 0.21.2 which only supported Python up to 3.12, and version 5.0.0 includes an updated PyO3 that supports Python 3.13.

Key Changes

• Update PKG_VERSION from 4.1.3 to 5.0.0
• Update PKG_HASH to match the SHA256 hash of the bcrypt 5.0.0 source tarball from PyPI

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