### Motivation See: - https://github.com/bazelbuild/bazel/releases/tag/8.4.0 - https://github.com/bazelbuild/bazel/releases/tag/8.4.1 - https://github.com/bazelbuild/bazel/releases/tag/8.4.2 (8.5.0 is due soon) #### Cache & reliability - 8.4.0 honors XDG_CACHE_HOME on macOS, which will definitely help ([ABLD-300](https://datadoghq.atlassian.net/browse/ABLD-300)): bazelbuild/bazel#26773 - 8.4.1 fixes a race condition affecting repository contents cache: bazelbuild/bazel#26950 - 8.4.0 fixes another race condition affecting workers: bazelbuild/bazel#26475 #### Modules - 8.4.0 brings new `--module_mirrors` flag for fallback URLs when primary sources are slow/unavailable: bazelbuild/bazel#26850 - 8.4.0 avoids the need for dummy `MODULE.bazel` files with `git_repository`/`http_archive`: bazelbuild/bazel#26462 - 8.4.2 fixes a maintenance annoyance for `MODULE.bazel.lock` file: bazelbuild/bazel#27111 #### Platforms - 8.4.0 allows to mitigate the long path issue with **MSVC on Windows**: bazelbuild/bazel#26532 - 8.4.2 fixes **macOS** compatibility issues: bazelbuild/bazel#27014 [ABLD-300]: https://datadoghq.atlassian.net/browse/ABLD-300?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ Co-authored-by: regis.desgroppes <regis.desgroppes@datadoghq.com>

[8.4.0] Fix a race condition caused by our semaphore-handling mechanism in WorkerMultiplexer. #26475

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