Issue #3260846: Update hook missing in HEAD for new option defaults

tests/fixtures/update/inline_all_css.update-hook-test.php

+<?php
+
+/**
+ * @file
+ * Sets up the database state for the upgrade path tests.
+ */
+
+use Drupal\Core\Database\Database;
+
+$connection = Database::getConnection();
+
+// Set the schema version.
+$connection->merge('key_value')
+  ->condition('collection', 'system.schema')
+  ->condition('name', 'inline_all_css')
+  ->fields([
+    'collection' => 'system.schema',
+    'name' => 'inline_all_css',
+    'value' => 's:4:"9000";',
+  ])
+  ->execute();
+
+// Add the proper core.extension configuration.
+$extensions = $connection->select('config')
+  ->fields('config', ['data'])
+  ->condition('collection', '')
+  ->condition('name', 'core.extension')
+  ->execute()
+  ->fetchField();
+$extensions = unserialize($extensions, ['allowed_classes' => []]);
+$extensions['module']['inline_all_css'] = 9000;
+$connection->update('config')
+  ->fields([
+    'data' => serialize($extensions),
+  ])
+  ->condition('collection', '')
+  ->condition('name', 'core.extension')
+  ->execute();