fix(java-spring): add missing BrowserStack browser/OS capabilities

Java Spring Selenium tests were failing with:
"Failed to initialize BrowserStack WebDriver: Could not start a new session"

Root cause: BrowserStack capabilities were missing os, osVersion,
browserName, and browserVersion specifications.

Added capabilities matching browserstack-devices.json config:
- os: Windows
- osVersion: 11
- browserName: Chrome
- browserVersion: latest

This was causing ALL test runs to fail with WebDriver initialization
errors, not just BROWSERSTACK_ALL_PARALLELS_IN_USE errors.

Author: Teodor Ciuraru

java-spring/src/test/java/com/ditto/example/spring/quickstart/TaskVisibilityIntegrationTest.java

@@ -51,6 +51,10 @@ private static void setupBrowserStackDriver(String username, String accessKey) {
             ChromeOptions options = new ChromeOptions();
 
             Map<String, Object> bsOptions = new HashMap<>();
+            bsOptions.put("os", "Windows");
+            bsOptions.put("osVersion", "11");
+            bsOptions.put("browserName", "Chrome");
+            bsOptions.put("browserVersion", "latest");
             bsOptions.put("sessionName", "Java Spring Task Visibility Test");
 
             String bsLocal = firstNonEmpty(System.getProperty("BROWSERSTACK_LOCAL"), System.getenv("BROWSERSTACK_LOCAL"));