googleads-php-lib-v52.0.0

Google Ads APIs Client Library for PHP v52.0.0

AdWords

• Updated laravel/framework version from 5.8.38 to 6.20.14 in
  LaravelSampleApp.

Ad Manager

• Added support for v202102.
• Removed support for v202002.
• Removed examples for v202005.
• Updated the v202102/LineItemService/CreateVideoLineItems.php example to use
  setVideoMaxDuration function.

Common

• Updated php version to ^7.3 as a dependency.
• Added symfony/serializer version ^3.0.3 as a dependency.
• Updated monolog/monolog version to ^2.2.0 as a dependency.
• Updated phpunit/phpunit version to ^9.5.2 as a development dependency.
• Migrated phpunit.xml.dist to comply with phpunit 9.5.2 schema.