Add type hint to RefinableCacheableDependencyTrait::addCacheableDependency

Problem/Motivation

Follow up to #3232018: Trigger a deprecation when using \Drupal\Core\Cache\RefinableCacheableDependencyTrait::addCacheableDependency with a non CacheableDependencyInterface object →

Add a type hint to the one parameter.

Steps to reproduce

Proposed resolution

See the change record → from the originating issue for details.

Remaining tasks

Postponed on 12.x branch
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User interface changes

Introduced terminology

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