[hibernate#2030] Upgrade MySQL jdbc driver to 9.1.0

Author: DavideD

hibernate-reactive-core/build.gradle

@@ -55,7 +55,7 @@ dependencies {
     testRuntimeOnly "org.mariadb.jdbc:mariadb-java-client:3.5.1"
 
     // JDBC driver for Testcontainers with MYSQL Server
-    testRuntimeOnly "com.mysql:mysql-connector-j:8.0.33"
+    testRuntimeOnly "com.mysql:mysql-connector-j:9.1.0"
 
     // JDBC driver for Db2 server, for testing
     testRuntimeOnly "com.ibm.db2:jcc:12.1.0.0"