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Make template Twig 3 compatible.

In "templates/pcp-template.html.twig" {% spaceless %} … {% endspaceless %} is used.
Twig 3 uses {% apply spaceless %} … {% endapply %}

Reference: https://www.drupal.org/node/3256890 →

Confirm this works in Drupal 10.3.1
Thank you.