chore(deps): lock file maintenance functions (google#2810)

This PR contains the following updates:

| Package | Type | Update | Change | Age | Adoption | Passing |
Confidence |
|---|---|---|---|---|---|---|---|
|  |  | lockFileMaintenance | All locks refreshed |  |  |  |  |
|
[google-cloud-secret-manager](https://redirect.github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-secret-manager)
([source](https://redirect.github.com/googleapis/google-cloud-python)) |
dependencies | minor | `==2.20.2` -> `==2.21.0` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/google-cloud-secret-manager/2.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/google-cloud-secret-manager/2.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/google-cloud-secret-manager/2.20.2/2.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/google-cloud-secret-manager/2.20.2/2.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

🔧 This Pull Request updates lock files to use the latest dependency
versions.

---

### Release Notes

<details>
<summary>googleapis/google-cloud-python
(google-cloud-secret-manager)</summary>

###
[`v2.21.0`](https://redirect.github.com/googleapis/google-cloud-python/releases/tag/google-cloud-secret-manager-v2.21.0):
google-cloud-secret-manager: v2.21.0

[Compare
Source](https://redirect.github.com/googleapis/google-cloud-python/compare/google-cloud-secret-manager-v2.20.2...google-cloud-secret-manager-v2.21.0)

##### Features

- Add support for Python 3.13
([#&#8203;13209](https://redirect.github.com/googleapis/google-cloud-python/issues/13209))
([5f2e30d](https://redirect.github.com/googleapis/google-cloud-python/commit/5f2e30d62eea6080f5707ee18755f2bb812ad00b))

</details>

---

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---

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