DATAJDBC-213 - Upgraded testcontainers dependency.

This fixes build failures on Travis-CI.
There is an additional test depency to apache commons necessary due to a bug in the testcontainers version.

See also: https://github.com/testcontainers/testcontainers-java/issues/656

pom.xml

@@ -33,7 +33,7 @@
 		<mysql-connector-java.version>5.1.41</mysql-connector-java.version>
 		<postgresql.version>42.0.0</postgresql.version>
 		<mariadb-java-client.version>2.2.3</mariadb-java-client.version>
-		<testcontainers.version>1.6.0</testcontainers.version>
+		<testcontainers.version>1.7.2</testcontainers.version>
 
 	</properties>
 
@@ -262,6 +262,13 @@
 			<version>${testcontainers.version}</version>
 			<scope>test</scope>
 		</dependency>
+		<!-- Workaround for https://github.com/testcontainers/testcontainers-java/issues/656-->
+		<dependency>
+			<groupId>commons-lang</groupId>
+			<artifactId>commons-lang</artifactId>
+			<version>2.6</version>
+			<scope>test</scope>
+		</dependency>
 
 	</dependencies>