Merge branch '11.x' into 3419734-jquery-4-jquery-form

.gitlab-ci.yml

core/.deprecation-ignore.txt

core/.eslintrc.jquery.json

core/.eslintrc.json

core/.eslintrc.legacy.json

core/COPYRIGHT.txt

core/assets/vendor/modernizr/README.md

core/assets/vendor/modernizr/modernizr.min.js

core/core.libraries.yml

core/includes/bootstrap.inc

...l/Component/Annotation/Doctrine/StaticReflectionClass.php

...ib/Drupal/Component/FileSystem/RegexDirectoryIterator.php

core/lib/Drupal/Component/Plugin/LazyPluginCollection.php

core/lib/Drupal/Component/Render/HtmlEscapedText.php

core/lib/Drupal/Core/Asset/CssCollectionOptimizer.php

core/lib/Drupal/Core/Asset/JsCollectionOptimizer.php

core/lib/Drupal/Core/Block/BlockPluginTrait.php

core/lib/Drupal/Core/Config/Schema/ArrayElement.php

core/lib/Drupal/Core/Database/Query/Condition.php

core/lib/Drupal/Core/Database/Query/InsertTrait.php