Update mysql-connector-j to 9.4.0

Author: scala-steward

build.sbt

@@ -10,7 +10,7 @@ lazy val fs2Version = "3.12.0"
 lazy val h2Version = "1.4.200"
 lazy val hikariVersion = "6.3.2" // N.B. Hikari v4 introduces a breaking change via slf4j v2
 lazy val kindProjectorVersion = "0.11.2"
-lazy val mysqlVersion = "9.3.0"
+lazy val mysqlVersion = "9.4.0"
 lazy val log4catsVersion = "2.7.1"
 lazy val postGisVersion = "2025.1.1"
 lazy val postgresVersion = "42.7.7"