Adding missing imports

Author: diemol

examples/java/src/test/java/dev/selenium/interactions/AlertsTest.java

@@ -23,8 +23,10 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.openqa.selenium.Alert;
+import org.openqa.selenium.By;
 import org.openqa.selenium.JavascriptExecutor;
 import org.openqa.selenium.WebDriver;
+import org.openqa.selenium.WebElement;
 import org.openqa.selenium.chrome.ChromeDriver;
 import org.openqa.selenium.chrome.ChromeOptions;
 import org.openqa.selenium.support.ui.ExpectedConditions;