Remove assertion in `ComputedUrlWithQueryString::calculateDependencies()` to allow contrib reuse

Overview

Update the calculateDependencies() method of class ComputedUrlWithQueryString class to prevent error when used by other contributed modules.

As part of ticket 📌 Decouple image (URI) shape matching from specific image file types/extensions Active , the ComputedUrlWithQueryString class was refactored to allow other contributed modules (e.g., Acquia DAM) to use it directly, eliminating the need to copy its code. An assert was removed to improve reusability, but the calculateDependencies() method was missed to be updated accordingly. This causes an error when the method is invoked:

AssertionError: assert($url_prop_expression instanceof ReferenceFieldTypePropExpression) in assert() (line 85 of /var/www/html/web/modules/contrib/canvas/src/Plugin/DataType/ComputedUrlWithQueryString.php).