Call newInstance on Constructor of driverClass (#1290)

Class.newInstance is deprecated as of Java 9. Usage should be replaced by calling Class.get(Declared)Constructor.newInstance

src/main/java/com/zaxxer/hikari/HikariConfig.java

@@ -486,7 +486,7 @@ public class HikariConfig implements HikariConfigMXBean
       }
 
       try {
-         driverClass.newInstance();
+         driverClass.getConstructor().newInstance();
          this.driverClassName = driverClassName;
       }
       catch (Exception e) {