test(deps): update dependency buf to v1.68.4 (main)

[renovate]

This PR contains the following updates:

Package	Update	Change
buf	minor	v1.67.0 → v1.68.4

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Release Notes

bufbuild/buf (buf)

v1.68.4

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• Fix duplicated extension tags across imports from compiler.

v1.68.3

Compare Source

• Fix buf format error handling for edition 2024.

v1.68.2

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• Fix build failures for modules with a vendored descriptor.proto.
• Fix LSP incorrectly reporting "edition '2024' not yet fully supported" errors.
• Fix CEL compilation error messages in buf lint to use the structured error API instead of parsing cel-go's text output.
• Add --debug-address flag to buf lsp serve to provide debug and profile support.

v1.68.1

Compare Source

• Revert the use of the new compiler report format and properly ungate Editions 2024 features.
• Fix absolute imports (leading-dot) marked unused in diagnostics.

v1.68.0

Compare Source

• Use new compiler for build process and support Editions 2024 features.
• Add LSP document links for buf.yaml deps, buf.gen.yaml remote plugins and input modules, buf.policy.yaml name and BSR plugins, and buf.lock dep names, making each a clickable link to its BSR page.
• Add LSP code lenses for buf.yaml files to update all dependencies (buf.dep.updateAll) or check for available updates (buf.dep.checkUpdates).
• Improve shell completions for buf flags with fixed value sets and file/directory arguments.
• Add buf curl URL path shell completions (service and method names) via
  server reflection, --schema, or the local buf module.
• Add support for Edition 2024 syntax to buf format.
• Fix buf generate --clean deleting files from nested plugin output directories.

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