Some Doctrine dependencies have been removed

The Doctrine project has split parts of doctrine/common into their own packages. Drupal core no longer uses any part of doctrine/common directly.

Drupal core now only depends on the following two packages directly:

• doctrine/annotations
• doctrine/reflection

These implicitly bring in the following packages as well:

• doctrine/instantiator
• doctrine/lexer

The following packages have been removed. If you rely on any of these as dependencies, you must declare them yourself in composer.json.

• doctrine/cache
• doctrine/collections
• doctrine/common
• doctrine/inflector