Use HikariCP is jdbc and jpa starters

This commit is a companion of what was done in #6013. As HikariCP is
now the default connection pool, the jdbc and jpa starters no longer
provide `tomcat-jdbc`, but rather `HikariCP`.

Closes gh-9392

spring-boot-devtools/src/test/java/org/springframework/boot/devtools/autoconfigure/DevToolsEmbeddedDataSourceAutoConfigurationTests.java

@@ -38,7 +38,7 @@ import static org.mockito.Mockito.verify;
  * @author Andy Wilkinson
  */
 @RunWith(ModifiedClassPathRunner.class)
-@ClassPathExclusions("tomcat-jdbc-*.jar")
+@ClassPathExclusions("HikariCP-*.jar")
 public class DevToolsEmbeddedDataSourceAutoConfigurationTests
 		extends AbstractDevToolsDataSourceAutoConfigurationTests {