deps: Update dependency pydantic to v2.5.3 (#181)

[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pydantic](https://togithub.com/pydantic/pydantic)
([changelog](https://docs.pydantic.dev/latest/changelog/)) | `==2.5.2`
-> `==2.5.3` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/pydantic/2.5.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/pydantic/2.5.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/pydantic/2.5.2/2.5.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/pydantic/2.5.2/2.5.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>pydantic/pydantic (pydantic)</summary>

###
[`v2.5.3`](https://togithub.com/pydantic/pydantic/releases/tag/v2.5.3):
2023-12-22

[Compare
Source](https://togithub.com/pydantic/pydantic/compare/v2.5.2...v2.5.3)

##### v2.5.3 (2023-12-22)

[GitHub
release](https://togithub.com/pydantic/pydantic/releases/tag/v2.5.3)

##### What's Changed

##### Packaging

-   uprev `pydantic-core` to 2.14.6

##### Fixes

- Fix memory leak with recursive definitions creating reference cycles
by [@&#8203;davidhewitt](https://togithub.com/davidhewitt) in
[pydantic/pydantic-core#1125](https://togithub.com/pydantic/pydantic-core/pull/1125)

Full Changelog:
pydantic/pydantic@v2.5.2...v2.5.3/

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Never, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Mend
Renovate](https://www.mend.io/free-developer-tools/renovate/). View
repository job log
[here](https://developer.mend.io/github/GoogleCloudPlatform/genai-databases-retrieval-app).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4xMzUuMCIsInVwZGF0ZWRJblZlciI6IjM3LjEzNS4wIiwidGFyZ2V0QnJhbmNoIjoibWFpbiJ9-->

Co-authored-by: Averi Kitsch <akitsch@google.com>

retrieval_service/requirements.txt

@@ -4,7 +4,7 @@ google-cloud-firestore==2.13.1
 google-cloud-aiplatform==1.38.1
 langchain==0.0.354
 pgvector==0.2.4
-pydantic==2.5.2
+pydantic==2.5.3
 uvicorn[standard]==0.25.0
 cloud-sql-python-connector==1.5.0
 sqlalchemy==2.0.25