deps: Update dependency cloud-sql-python-connector to v1.6.0 (#216)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[cloud-sql-python-connector](https://togithub.com/GoogleCloudPlatform/cloud-sql-python-connector)
| `==1.5.0` -> `==1.6.0` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/cloud-sql-python-connector/1.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/cloud-sql-python-connector/1.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/cloud-sql-python-connector/1.5.0/1.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

---

### Release Notes

<details>
<summary>GoogleCloudPlatform/cloud-sql-python-connector
(cloud-sql-python-connector)</summary>

###
[`v1.6.0`](https://togithub.com/GoogleCloudPlatform/cloud-sql-python-connector/blob/HEAD/CHANGELOG.md#160-2024-01-17)

[Compare
Source](https://togithub.com/GoogleCloudPlatform/cloud-sql-python-connector/compare/v1.5.0...v1.6.0)

##### Features

- add support for domain-scoped projects
([#&#8203;937](https://togithub.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/937))
([3d1f36e](https://togithub.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/3d1f36e176d1689380d71fc56f111dbb8de34dcb))

##### Dependencies

- Update dependency google-auth to v2.26.2
([#&#8203;964](https://togithub.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/964))
([43d7ad6](https://togithub.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/43d7ad6d7b57454256b933580d51113cc22a2206))
- update dependency pg8000 to v1.30.4
([#&#8203;962](https://togithub.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/962))
([8012c8f](https://togithub.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/8012c8f7d32cd59f851638d7167067f2804125f6))

</details>

---

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---

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Co-authored-by: Yuan <45984206+Yuan325@users.noreply.github.com>
Co-authored-by: Wenxin Du <117315983+duwenxin99@users.noreply.github.com>

retrieval_service/requirements.txt

@@ -6,5 +6,5 @@ langchain==0.1.5
 pgvector==0.2.5
 pydantic==2.5.3
 uvicorn[standard]==0.27.0.post1
-cloud-sql-python-connector==1.5.0
+cloud-sql-python-connector==1.6.0
 sqlalchemy==2.0.25