Update dependency mysql-connector-python to ^9.4.0 (#460)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
|
[mysql-connector-python](https://redirect.github.com/mysql/mysql-connector-python)
([changelog](https://dev.mysql.com/doc/relnotes/connector-python/en/)) |
`^9.3.0` -> `^9.4.0` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/mysql-connector-python/9.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/mysql-connector-python/9.3.0/9.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>mysql/mysql-connector-python (mysql-connector-python)</summary>

###
[`v9.4.0`](https://redirect.github.com/mysql/mysql-connector-python/blob/HEAD/CHANGES.txt#v940)

[Compare
Source](https://redirect.github.com/mysql/mysql-connector-python/compare/9.3.0...9.4.0)

\======

-
[WL#16966](https://redirect.github.com/WL/mysql-connector-python/issues/16966):
Upgrade Python lz4 version
-
[WL#16963](https://redirect.github.com/WL/mysql-connector-python/issues/16963):
Update the OpenTelemetry version
-
[WL#16962](https://redirect.github.com/WL/mysql-connector-python/issues/16962):
Update the Python Protobuf version
-
[WL#16954](https://redirect.github.com/WL/mysql-connector-python/issues/16954):
Make sdist packages pip installable
-
[BUG#38072835](https://redirect.github.com/BUG/mysql-connector-python/issues/38072835):
Authentication OCI plugin option parameters not being supported by the
aio connector
-
[BUG#37868219](https://redirect.github.com/BUG/mysql-connector-python/issues/37868219):
RPM packages have incorrect copyright year in their metadata
-
[BUG#37859771](https://redirect.github.com/BUG/mysql-connector-python/issues/37859771):
mysql/connector python version 9.3.0 has a regression which cannot
persist binary data with percent signs in it
-
[BUG#37820231](https://redirect.github.com/BUG/mysql-connector-python/issues/37820231):
Text based django ORM filters doesn't work with Connector/Python
-
[BUG#37806057](https://redirect.github.com/BUG/mysql-connector-python/issues/37806057):
Rename extra option (when installing wheel package) to install webauthn
functionality dependencies
-
[BUG#37774513](https://redirect.github.com/BUG/mysql-connector-python/issues/37774513):
Inconsistent conversion to\_sql for cext vs pure python
-
[BUG#37642447](https://redirect.github.com/BUG/mysql-connector-python/issues/37642447):
The license type is missing from RPM package
-
[BUG#37627508](https://redirect.github.com/BUG/mysql-connector-python/issues/37627508):
mysql/connector python fetchmany() has an off by one bug when argument
given as 1
-
[BUG#37047789](https://redirect.github.com/BUG/mysql-connector-python/issues/37047789):
Python connector does not support Django enum
-
[BUG#36733242](https://redirect.github.com/BUG/mysql-connector-python/issues/36733242):
Contribution: Add Connection Pooling Support for AsyncIO Connector
-
[BUG#36452514](https://redirect.github.com/BUG/mysql-connector-python/issues/36452514):
Missing version info resources
-
[BUG#34950958](https://redirect.github.com/BUG/mysql-connector-python/issues/34950958):
MySQL Python Connector doesn't work with ssh in the same process
-
[BUG#34844347](https://redirect.github.com/BUG/mysql-connector-python/issues/34844347):
Freezes on connection via sshtunnel

</details>

---

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poetry.lock

@@ -53,7 +53,7 @@ ops = "^2.9.0"
 pytest = "^8.4.1"
 pytest-operator = "^0.35.0"
 juju = "^3.6.0.0"
-mysql-connector-python = "^9.3.0"
+mysql-connector-python = "^9.4.0"
 pyyaml = "^6.0.2"
 tenacity = "^9.1.2"
 allure-pytest = "^2.14.3"