Depend on drupal/core instead of core-recommended [#3573701]

The following commit
https://git.drupalcode.org/project/dropdown_language/-/commit/4dfacf8778...
introduces core-recommended as requirement leaving out all sites that don't lock dependencies of drupal/core

Run

composer -W req "drupal/dropdown_language:dev-4.1.x#55e1ec4f78888c09ef62d63acfbb858b2b651ffb"

core-recommended becomes a dependency for sites that didn't have them

Depend on drupal/core as befoe

Code

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3573701-depend-on-drupalcore changes, plain diff MR !37
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