Upgrade Oracle JDBC driver to the latest working version.

Turns out the latest working version for Spring Data JDBC is ojdbc8 19.15.0.0.1. ojdbc11 or later versions of ojdbc8 contain a bug that breaks batching.

Since Spring Data R2DBC only uses the driver for testing. fFor it the latest working version is ojdbc11 21.6.0.0.1.

Closes #1270

pom.xml

@@ -37,7 +37,7 @@
 		<mssql.version>9.2.1.jre8</mssql.version>
 		<mysql-connector-java.version>8.0.29</mysql-connector-java.version>
 		<postgresql.version>42.4.0</postgresql.version>
-		<oracle.version>19.6.0.0</oracle.version>
+		<oracle.version>19.15.0.0.1</oracle.version>
 
 		<!-- test utilities-->
 		<awaitility.version>4.2.0</awaitility.version>

spring-data-r2dbc/pom.xml

@@ -214,7 +214,7 @@
 		<dependency>
 			<groupId>com.oracle.database.jdbc</groupId>
 			<artifactId>ojdbc11</artifactId>
-			<version>21.4.0.0.1</version>
+			<version>21.6.0.0.1</version>
 			<scope>test</scope>
 		</dependency>