pin torch to 2.7.0

Author: chibu

src/automation/tasks/arenahard_generate.py

@@ -10,6 +10,7 @@
 class ArenaHardGenerateTask(BaseTask):
 
     arenahard_packages = [
+        "torch==2.7.0",
         "transformers==4.48.1",
         #"transformers==4.53.0",
         "huggingface-hub==0.34.3",