chore(deps): update dependency cloud-sql-python-connector to v1.2.1 (#9284)

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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) | `==1.2.0` -> `==1.2.1` | [![age](https://badges.renovateapi.com/packages/pypi/cloud-sql-python-connector/1.2.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/cloud-sql-python-connector/1.2.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/cloud-sql-python-connector/1.2.1/compatibility-slim/1.2.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/cloud-sql-python-connector/1.2.1/confidence-slim/1.2.0)](https://docs.renovatebot.com/merge-confidence/) |

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### ⚠ Dependency Lookup Warnings ⚠

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### Release Notes

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

### [`v1.2.1`](https://togithub.com/GoogleCloudPlatform/cloud-sql-python-connector/blob/HEAD/CHANGELOG.md#&#8203;121-httpsgithubcomGoogleCloudPlatformcloud-sql-python-connectorcomparev120v121-2023-03-14)

[Compare Source](https://togithub.com/GoogleCloudPlatform/cloud-sql-python-connector/compare/v1.2.0...v1.2.1)

##### Bug Fixes

-   update dependencies to latest versions ([#&#8203;646](https://togithub.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/646)) ([d758987](https://togithub.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/d758987ac0cc0bf2e978a4c4b50a3b0809f457f0))

</details>

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cloud-sql/mysql/sqlalchemy/requirements.txt

@@ -2,4 +2,4 @@ Flask==2.1.0
 SQLAlchemy==2.0.4
 PyMySQL==1.0.2
 gunicorn==20.1.0
-cloud-sql-python-connector==1.2.0
+cloud-sql-python-connector==1.2.1

cloud-sql/postgres/sqlalchemy/requirements.txt

@@ -1,5 +1,5 @@
 Flask==2.1.0
 pg8000==1.24.2
 SQLAlchemy==2.0.4
-cloud-sql-python-connector==1.2.0
+cloud-sql-python-connector==1.2.1
 gunicorn==20.1.0

cloud-sql/sql-server/sqlalchemy/requirements.txt

@@ -3,5 +3,5 @@ gunicorn==20.1.0
 python-tds==1.12.0
 pyopenssl==23.0.0
 SQLAlchemy==2.0.4
-cloud-sql-python-connector==1.2.0
+cloud-sql-python-connector==1.2.1
 sqlalchemy-pytds==0.3.5