Upgrade to MySQL 8.0.

Switch to a newer MySQL version to use TLSv1.2 as newer JRE versions no longer support TLSv1/TLSv1.1.

Closes #594.

Author: mp911de

src/test/java/org/springframework/data/r2dbc/testing/MySqlTestSupport.java

@@ -28,7 +28,6 @@
 
 import org.testcontainers.containers.MySQLContainer;
 
-import com.github.jasync.r2dbc.mysql.MysqlConnectionFactoryProvider;
 import com.mysql.cj.jdbc.MysqlDataSource;
 
 /**
@@ -98,7 +97,7 @@ private static ExternalDatabase local() {
 				.database("mysql") //
 				.username("root") //
 				.password("my-secret-pw") //
-				.jdbcUrl("jdbc:mysql://localhost:3306/mysql") //
+				.jdbcUrl("jdbc:mysql://localhost:3306/mysql?allowPublicKeyRetrieval=true") //
 				.build();
 	}
 
@@ -110,7 +109,7 @@ private static ExternalDatabase testContainer() {
 		if (testContainerDatabase == null) {
 
 			try {
-				MySQLContainer container = new MySQLContainer(MySQLContainer.IMAGE + ":" + MySQLContainer.DEFAULT_TAG);
+				MySQLContainer container = new MySQLContainer("mysql:8.0.24");
 				container.start();
 
 				testContainerDatabase = ProvidedDatabase.builder(container) //
@@ -153,7 +152,7 @@ public static DataSource createDataSource(ExternalDatabase database) {
 
 		dataSource.setUser(database.getUsername());
 		dataSource.setPassword(database.getPassword());
-		dataSource.setURL(database.getJdbcUrl() + "?useSSL=false");
+		dataSource.setURL(database.getJdbcUrl() + "?useSSL=false&allowPublicKeyRetrieval=true");
 
 		return dataSource;
 	}