chore(release): 1.0.0-alpha.5 [skip ci]

# [1.0.0-alpha.5](https://git.gitlab.arm.com/bazel/rules_toolchain/compare/v1.0.0-alpha.4...v1.0.0-alpha.5) (2023-11-16)

### Bug Fixes

* **release:** tidy up `metadata.json` naming in GitLab UI ([d5029b95](https://git.gitlab.arm.com/bazel/rules_toolchain/commit/d5029b95ddd3cda4556bad52f2b985df0abdc23b))