fix: use single quotes in fontsource Vite assertion (MAN-139)

Pint failed the static CI job on bunny( with double quotes.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/Feature/PublicSite/HeritageEditorialTokensTest.php

@@ -73,7 +73,7 @@ class HeritageEditorialTokensTest extends TestCase
         $vite = (string) file_get_contents(base_path('vite.config.js'));
 
         $this->assertStringContainsString("fontsource('EB Garamond'", $vite);
-        $this->assertStringNotContainsString("bunny(", $vite);
+        $this->assertStringNotContainsString('bunny(', $vite);
         $this->assertStringNotContainsString('google(', $vite);
         $this->assertStringNotContainsString('Instrument Sans', $vite);
     }