Update dependency com_github_bazelbuild_buildtools to v6

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This PR contains the following updates:

Package	Type	Update	Change
com_github_bazelbuild_buildtools	http_archive	major	5.1.0 -> v6.4.0

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Release Notes

bazelbuild/buildtools (com_github_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

v6.1.0: (2023-03-30)

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• [INC] Buildifier now sorts additional attributes of build rules: test_srcs, test_deps, test_data, test_tags, implementation_deps, and private_deps. Buildifier also treats them as labels (except for test_tags`) and shortens them if necessary.
  • [INC] Buildifier now applies the sorting/simplification rules for attributes if their values aren't necessarily plain lists of strings but also combinations of lists, select statements and other expressions (sorting each top-level list and each list inside select statements independently).
  • In WORKSPACE files buildifier doesn't merge loads if they load the same symbol but from different sources.
  • Buildozer preserves Module-specific formatting rules when operates on MODULE files.

v6.0.1: (2023-01-31)

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• .buildifier.json config file
  • Minor fixes and improvements

v6.0.0: (2023-01-10)

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• Buildozer: supported deleting of wildcard attributes
  • Buildozer: remove_if_equal command
  • Buildifier: updates to the formatting of WORKSPACE files
  • buildifier_test can escape the sandbox
  • Bug fixes

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Configuration

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