Unknown "spaceless" tag. in Twig\Parser->subparse() (line 13 of themes/contrib/coffee_zymphonies_theme/templates/form/select.html.twig).

This theme uses Twig 2 syntax and Drupal 10 requires Twig 3. In Twig 3 spaceless filter has to be added with the apply tag.

The following files in this theme have to be modified to make it compatible with Drupal 10.
templates/field/link-formatter-link-separate.html.twig
templates/form/select.html.twig
templates/form/dropbutton-wrapper.html.twig
templates/navigation/toolbar.html.twig

-      {% spaceless %}
+      {% apply spaceless %}

-     {% endspaceless%}
+     {% endapply%}

thanks @gintass, I am also facing the same issue & {% apply spaceless %} {% endspaceless%} fixed the issue. So I have created a patch for it.
@Abh1shek Chauhan please verify it and close this ticket.
Changing status to Needs Review.

Hi @SandeepSingh199,

The patch did not apply.