chore: update dependency com.mysql:mysql-connector-j to v8.4.0 (#1401)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[com.mysql:mysql-connector-j](http://dev.mysql.com/doc/connector-j/en/)
([source](https://togithub.com/mysql/mysql-connector-j)) | `8.3.0` ->
`8.4.0` |
[![age](https://developer.mend.io/api/mc/badges/age/maven/com.mysql:mysql-connector-j/8.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.mysql:mysql-connector-j/8.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.mysql:mysql-connector-j/8.3.0/8.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

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---

### Release Notes

<details>
<summary>mysql/mysql-connector-j (com.mysql:mysql-connector-j)</summary>

###
[`v8.4.0`](https://togithub.com/mysql/mysql-connector-j/compare/8.3.0...8.4.0)

[Compare
Source](https://togithub.com/mysql/mysql-connector-j/compare/8.3.0...8.4.0)

</details>

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gradle/libs.versions.toml

@@ -33,7 +33,7 @@ h2 = "1.4.197" # do not update, leads to database incompatibility
 xodus = "2.0.1"
 mongodb = "5.1.0"
 hikariCp = "5.1.0"
-mysqlConnector = "8.3.0"
+mysqlConnector = "8.4.0"
 
 # general
 asm = "9.7"