Fix finetuning python regex syntax error (opea-project#1446)

Signed-off-by: Eero Tamminen <eero.t.tamminen@intel.com>

Author: eero-t

comps/finetuning/src/integrations/native.py

@@ -201,7 +201,7 @@ def list_finetuning_checkpoints(self, request: FineTuningJobIDRequest):
             for file in files:  # Loop over directory contents
                 file_path = os.path.join(output_dir, file)
                 if os.path.isdir(file_path) and file.startswith("checkpoint"):
-                    steps = re.findall("\d+", file)[0]
+                    steps = re.findall(r"\d+", file)[0]
                     checkpointsResponse = FineTuningJobCheckpoint(
                         id=f"ftckpt-{uuid.uuid4()}",  # Generate a unique ID
                         created_at=int(time.time()),  # Use the current timestamp