silence psalm

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

Author: blizzz

build/psalm-baseline.xml

@@ -3371,6 +3371,9 @@
       <code>$content !== ''</code>
       <code>$type === 'pdo'</code>
     </RedundantCondition>
+    <UndefinedVariable occurrences="1">
+      <code>$vendor</code>
+    </UndefinedVariable>
   </file>
   <file src="lib/private/Setup/AbstractDatabase.php">
     <UndefinedThisPropertyFetch occurrences="4">