chore(deps): update dependency @bufbuild/buf to v1.40.0 (#454)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [@bufbuild/buf](https://redirect.github.com/bufbuild/buf) | [`1.39.0`
->
`1.40.0`](https://renovatebot.com/diffs/npm/@bufbuild%2fbuf/1.39.0/1.40.0)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@bufbuild%2fbuf/1.40.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@bufbuild%2fbuf/1.40.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@bufbuild%2fbuf/1.39.0/1.40.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

---

### Release Notes

<details>
<summary>bufbuild/buf (@&#8203;bufbuild/buf)</summary>

###
[`v1.40.0`](https://redirect.github.com/bufbuild/buf/blob/HEAD/CHANGELOG.md#v1400---2024-09-04)

[Compare
Source](https://redirect.github.com/bufbuild/buf/compare/v1.39.0...v1.40.0)

- Add concept of a default lint or breaking rule, which is printed out
as a property when running
`buf config ls-{breaking,lint}-rules`. Default rules are those rules
which are run if no lint
    or breaking rules are explicitly configured in your `buf.yaml`.
- Rename `DEFAULT` lint rule category to `STANDARD`. With the concept of
default rules being introduced,
having a category named `DEFAULT` is confusing, as while it happens that
all the rules in the `DEFAULT`
lint category are also default rules, the name has become overloaded. As
with all `buf` changes, this
change is backwards-compatible: the `DEFAULT` lint category continues to
work, and always will. We
    recommend changing to `STANDARD`, however.

</details>

---

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