chore(release): 1.0.0-beta.3 [skip ci]

# [1.0.0-beta.3](https://git.gitlab.arm.com/bazel/rules_xz/compare/v1.0.0-beta.2...v1.0.0-beta.3) (2024-09-03)

### Features

* add C/C++ `xz` toolchain ([8bcc4ef0](https://git.gitlab.arm.com/bazel/rules_xz/commit/8bcc4ef0ff87a651ad811e7ecfdf8a02934ac1a6))