fix(test): update PyPDF2 patch references to pypdf in path traversal security test

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_path_traversal_security.py

@@ -144,8 +144,8 @@ class TestEmbedMetadataPathTraversal:
     @patch("app.tasks.embed_metadata_into_pdf.SessionLocal")
     @patch("app.tasks.embed_metadata_into_pdf.log_task_progress")
     @patch("app.tasks.embed_metadata_into_pdf.finalize_document_storage")
-    @patch("PyPDF2.PdfReader")
-    @patch("PyPDF2.PdfWriter")
+    @patch("pypdf.PdfReader")
+    @patch("pypdf.PdfWriter")
     def test_embed_metadata_full_flow_with_malicious_filename(
         self,
         mock_pdf_writer,