Calling static trait method is deprecrated in PHP 8.1

Problem/Motivation

Deprecation notices when running test suite with PHP 8.1:

Drupal\Tests\oembed_providers\Functional\ProviderBucketTest

exception: [Other] Line 0 of sites/default/files/simpletest/phpunit-3.xml:
PHPUnit Test failed to complete; Error: PHPUnit 9.5.20 �[44m#StandWith�[0m�[43mUkraine�[0m

Warning:       Your XML configuration validates against a deprecated schema.
Suggestion:    Migrate your XML configuration using "--migrate-configuration"!

Testing Drupal\Tests\oembed_providers\Functional\ProviderBucketTest
EE.                                                                 3 / 3 (100%)

Time: 00:14.921, Memory: 6.00 MB

There were 2 errors:

1) Drupal\Tests\oembed_providers\Functional\ProviderBucketTest::testRoutePermissions
Exception: Deprecated function: Calling static trait method Drupal\oembed_providers\Traits\HelperTrait::disabledProviderSecurityWarning is deprecated, it should only be called on a class using the trait
Drupal\oembed_providers\OembedProviderBucketForm->form()() (Line: 86)


/var/www/html/core/lib/Drupal/Core/Test/HttpClientMiddleware/TestHttpClientMiddleware.php:49
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:204
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:153
/var/www/html/vendor/guzzlehttp/promises/src/TaskQueue.php:48
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:248
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:224
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:269
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:226
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:62
/var/www/html/vendor/guzzlehttp/guzzle/src/Client.php:182
/var/www/html/core/tests/Drupal/Tests/DrupalTestBrowser.php:137
/var/www/html/vendor/symfony/browser-kit/Client.php:404
/var/www/html/vendor/friends-of-behat/mink-browserkit-driver/src/BrowserKitDriver.php:145
/var/www/html/vendor/behat/mink/src/Session.php:148
/var/www/html/core/tests/Drupal/Tests/UiHelperTrait.php:334
/var/www/html/modules/contrib/oembed_providers/tests/src/Functional/ProviderBucketTest.php:92
/var/www/html/vendor/phpunit/phpunit/src/Framework/TestResult.php:726

2) Drupal\Tests\oembed_providers\Functional\ProviderBucketTest::testProviderBucketForm
Exception: Deprecated function: Calling static trait method Drupal\oembed_providers\Traits\HelperTrait::disabledProviderSecurityWarning is deprecated, it should only be called on a class using the trait
Drupal\oembed_providers\OembedProviderBucketForm->form()() (Line: 86)


/var/www/html/core/lib/Drupal/Core/Test/HttpClientMiddleware/TestHttpClientMiddleware.php:49
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:204
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:153
/var/www/html/vendor/guzzlehttp/promises/src/TaskQueue.php:48
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:248
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:224
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:269
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:226
/var/www/html/vendor/guzzlehttp/promises/src/Promise.php:62
/var/www/html/vendor/guzzlehttp/guzzle/src/Client.php:182
/var/www/html/core/tests/Drupal/Tests/DrupalTestBrowser.php:137
/var/www/html/vendor/symfony/browser-kit/Client.php:404
/var/www/html/vendor/friends-of-behat/mink-browserkit-driver/src/BrowserKitDriver.php:145
/var/www/html/vendor/behat/mink/src/Session.php:148
/var/www/html/core/tests/Drupal/Tests/UiHelperTrait.php:334
/var/www/html/modules/contrib/oembed_providers/tests/src/Functional/ProviderBucketTest.php:114
/var/www/html/vendor/phpunit/phpunit/src/Framework/TestResult.php:726

ERRORS!
Tests: 3, Assertions: 34, Errors: 2.

Steps to reproduce

Run test suite with PHP 8.1.

Proposed resolution

Change the class to use the trait and call the trait method with the class (instead of statically).

Remaining tasks

Submit patch.

User interface changes

None

API changes

None.

Data model changes

None.