Upgrade MySql Docker image to version 8.0.29.

Closes #1271

Author: schauder

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/testing/MySqlDataSourceConfiguration.java

@@ -48,7 +48,7 @@ protected DataSource createDataSource() {
 
 		if (MYSQL_CONTAINER == null) {
 
-			MySQLContainer<?> container = new MySQLContainer<>("mysql:8.0.24").withUsername("test").withPassword("test")
+			MySQLContainer<?> container = new MySQLContainer<>("mysql:8.0.29").withUsername("test").withPassword("test")
 					.withConfigurationOverride("");
 
 			container.start();