chore(release): 1.0.0-alpha.6 [skip ci]

# [1.0.0-alpha.6](https://git.gitlab.arm.com/bazel/rules_curl/compare/v1.0.0-alpha.5...v1.0.0-alpha.6) (2024-02-15)

### Bug Fixes

* switch to `toolchain_utils`/`ape` from BCR ([2d3127a5](https://git.gitlab.arm.com/bazel/rules_curl/commit/2d3127a5c51e0e4604a3dbead5f2d37c560dbb2f))