deps: Update dependency pandas-stubs to v2.2.2.240603 (#401)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pandas-stubs](https://pandas.pydata.org)
([source](https://togithub.com/pandas-dev/pandas-stubs)) |
`==2.2.2.240514` -> `==2.2.2.240603` |
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|
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|
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|
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|

---

### Release Notes

<details>
<summary>pandas-dev/pandas-stubs (pandas-stubs)</summary>

###
[`v2.2.2.240603`](https://togithub.com/pandas-dev/pandas-stubs/compare/v2.2.2.240514...v2.2.2.240603)

[Compare
Source](https://togithub.com/pandas-dev/pandas-stubs/compare/v2.2.2.240514...v2.2.2.240603)

</details>

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retrieval_service/requirements.txt

@@ -12,7 +12,7 @@ cloud-sql-python-connector==1.6.0
 google-cloud-alloydb-connector[asyncpg]==1.1.1
 sqlalchemy==2.0.25
 pandas==2.2.2
-pandas-stubs==2.2.2.240514
+pandas-stubs==2.2.2.240603
 langchain-text-splitters==0.2.0
 langchain-google-vertexai==1.0.4
 asyncio==3.4.3