build: run unit tests against newer version of iOS

Updates the unit tests to run against iOS 18 in an attempt to make them more stable.

Author: crisbeto

test/browser-providers.js

@@ -5,7 +5,7 @@
  *   - `saucelabs`: Launches the browser within Saucelabs
  */
 const browserConfig = {
-  'iOS15': {unitTest: {target: 'saucelabs'}},
+  'iOS18': {unitTest: {target: 'saucelabs'}},
   'Safari16': {unitTest: {target: 'browserstack'}},
 };
 

test/karma-browsers.json

@@ -1,12 +1,12 @@
 {
-  "SAUCELABS_IOS15": {
+  "SAUCELABS_IOS18": {
     "base": "SauceLabs",
     "appiumVersion": "1.22.0",
     "deviceOrientation": "portrait",
     "browserName": "Safari",
-    "platformVersion": "15.0",
+    "platformVersion": "18.0",
     "platformName": "iOS",
-    "deviceName": "iPhone 13 Pro Max Simulator"
+    "deviceName": "iPhone 15 Pro Max Simulator"
   },
   "BROWSERSTACK_SAFARI16": {
     "base": "BrowserStack",