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

# [1.0.0-beta.9](https://git.gitlab.arm.com/bazel/toolchain_utils/compare/v1.0.0-beta.8...v1.0.0-beta.9) (2024-05-03)

### Features

* add `toolchain_info` rule ([11ea2416](https://git.gitlab.arm.com/bazel/toolchain_utils/commit/11ea241647f87759bebd2c5ce7a7b0bdba55953a))

### BREAKING CHANGES

* The `toolchain_symlink_target` no longer exports
`ToolchainInfo`/`TemplateVariableInfo`.

The `toolchain_info` can provide those providers. The `toolchain_symlink_target`
is purely for creating a symlink to a previous target. This still enables
changing the basename for multi-call binaries.

To gain the old functionality, if `basename` attribute is not being used,
`toolchain_symlink_target` can be switched directly for `toolchain_info`. If
`basename` is being used, an extra `toolchain_info` rule will need to be created
to wrap the `toolchain_symlink_target` rule.