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Migrate XLS to Bazel 9 #4472

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@mikex-oss

Now that #2941 is done, we should start planning on migrating to Bazel 9, the active LTS version at the time of this writing. Bazel 8 has entered maintenance mode.

Major differences are documented here: https://blog.bazel.build/2026/01/20/bazel-9.html

Since we are fully on bzmod, probably the main blocker is the Starlarkification of language rules.

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    buildRelated to build flow, build system, or build macros🧑‍🌾 gardenerTo be handed off to the next build gardener

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