chore: update to latest buildifier

[aignas]

Upgrade to the latest buildifier and fix an example.

[gemini-code-assist]

Summary of Changes

Hello @aignas, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on a routine maintenance task: upgrading the buildifier tool to its latest version, 8.2.1. This update ensures that the project's Bazel files adhere to the most current formatting and linting standards, which in turn automatically applied some minor stylistic adjustments to existing Bazel configuration files.

Highlights

• Buildifier Version Upgrade: The buildifier tool and its associated pre-commit hook have been updated from version 6.1.0 to 8.2.1 across the project's configuration files.
• Automated Formatting Adjustments: Minor formatting changes, including the addition of a blank line in MODULE.bazel and a new load statement in BUILD.bazel, were applied, likely as a direct result of the buildifier upgrade enforcing new style guidelines.

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[gemini-code-assist]

Code Review

This pull request updates buildifier to version 8.2.1. The version bump is correctly applied to the configuration files. The PR also includes automatic formatting changes from the new buildifier version, which are a stylistic newline addition and a correctness fix that adds a missing load statement. The changes are sound and improve the repository's maintenance tooling. The PR is good to merge.