Add @codeCoverageIgnore annotation to NullTagAwareAdapter

The @codeCoverageIgnore annotation was added to suppress coverage checks on the NullTagAwareAdapter class. This change ensures that code coverage tools do not flag this intended mock implementation.

src/NullTagAwareAdapter.php

@@ -8,7 +8,10 @@
 use Symfony\Component\Cache\Adapter\TagAwareAdapterInterface;
 use Symfony\Component\Cache\CacheItem;
 
-/** @SuppressWarnings UnusedFormalParameter */
+/**
+ * @SuppressWarnings UnusedFormalParameter
+ * @codeCoverageIgnore
+ */
 final class NullTagAwareAdapter implements TagAwareAdapterInterface
 {
     public function getItem(mixed $key): CacheItem