chore(release): 1.0.0-alpha.9 [skip ci]

# [1.0.0-alpha.9](https://git.gitlab.arm.com/bazel/rules_toolchain/compare/v1.0.0-alpha.8...v1.0.0-alpha.9) (2023-12-13)

### Bug Fixes

* create hardlinks on Windows ([fb7691df](https://git.gitlab.arm.com/bazel/rules_toolchain/commit/fb7691df6a7948dd19cddceca2a169480ed40913))
* set minimum version to Bazel 7 ([0db2cc79](https://git.gitlab.arm.com/bazel/rules_toolchain/commit/0db2cc79ca316ef76fb02c33baf35810479dbc59))

### Features

* add `msvc` C library constraint ([f638f1fa](https://git.gitlab.arm.com/bazel/rules_toolchain/commit/f638f1fa59df687302443216857d6353a48e9f64))