build(deps): remove discoverable_entity_bundle_classes

As this module is no longer supported, remove it from the codebase and
update all references to it within the custom code - instead manually
wrapping nodes with the `Post` or `Talk` class, or returning it from a
Repository.

Fixes: #465

web/modules/custom/talks/src/Collection/TalkCollection.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Drupal\opdavies_talks\Collection;
 
+use Drupal\node\NodeInterface;
 use Drupal\opdavies_talks\Entity\Node\Talk;
 use Drupal\paragraphs\ParagraphInterface;
 use Illuminate\Support\Collection;
@@ -16,7 +17,8 @@ final class TalkCollection extends Collection {
    * @return Collection|ParagraphInterface[]
    */
   public function getEvents(): Collection {
-    return $this->flatMap(fn(Talk $talk): Collection => $talk->getEvents());
+    return $this
+      ->flatMap(fn(Talk $talk): Collection => $talk->getEvents());
   }
 
 }