test(deps): update dependency buf to v1.69.0 (main)

[renovate]

This PR contains the following updates:

Package	Update	Change
buf	minor	v1.68.4 → v1.69.0

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Release Notes

bufbuild/buf (buf)

v1.69.0

Compare Source

• Increase check plugin WASM memory limits to 1GiB.
• Fix LSP stale diagnostics persisting after a file is closed or deleted.
• Fix handling of unprefixed newlines in block comments.
• Add LSP code lenses for buf.gen.yaml files: "Run buf generate" and "Check for plugin updates".
• Add LSP warnings for lint.ignore and breaking.ignore paths in buf.yaml that do not match any file in the workspace.

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