ISTWCMS-4535 Change assertNotEqual() to assertNotEquals()

Change record:
https://www.drupal.org/node/3129738

tests/src/Functional/UwWcmsBasicTest.php

@@ -1763,7 +1763,7 @@ class UwWcmsBasicTest extends BrowserTestBase {
     // The default color is 'Default[uWaterloo]' and not have "none" option.
     $options = $this->getOptions('settings[block_form][field_uw_ff_fact_figure][0][subform][field_uw_ff_def_color]');
     foreach ($options as $option) {
-      $this->assertNotEqual('- None -', $option);
+      $this->assertNotEquals('- None -', $option);
     }
     $this->assertFieldByXPath('//option[@value="org-default" and @selected="selected"]', NULL, 'Default uWaterloo is selected.');
     // The type includes 'Small highlight' with value 'small'.