chore(deps): update dependency bazelbuild/buildtools to v6.4.0

[renovate]

This PR contains the following updates:

Package	Update	Change
bazelbuild/buildtools	minor	6.1.0 -> v6.4.0

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Release Notes

bazelbuild/buildtools (bazelbuild/buildtools)

v6.4.0: Release 6.4.0 (2023-11-15)

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• More correct sorting order of load statements
• Buildozer: better error reporting for missing comments
• Suggested fixes for package-on-top warnings

v6.3.3: Release 6.3.3 (2023-08-25)

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• out_of_order_load warning is enabled by default
• format command for buildozer for unconditional formatting

v6.3.2: Release 6.3.2 (2023-08-17)

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• Updates to buildozer commands (use_repo and use_repo_add).
• Bug fixes.

v6.1.2: Release 6.1.2 (2023-04-27)

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Technical release.

Version tag on GitHub now start with v, e.g. v6.1.2 for the current release.

v6.1.1: (2023-04-26)

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• Added external repo support for unused_deps
  • Added use_repo_add, use_repo_remove, and set_select command for Builldozer
  • Bug fixes

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