Move transformers to default dependencies

pyproject.toml

@@ -71,6 +71,7 @@ dependencies = [
     "termcolor>=2.4.0",
     "torch>=2.2.1",
     "torchvision>=0.21.0",
+    "transformers>=4.48.0",
     "wandb>=0.16.3",
     "zarr>=2.17.0",
 ]
@@ -84,7 +85,6 @@ dora = [
 dynamixel = ["dynamixel-sdk>=3.7.31", "pynput>=1.7.7"]
 feetech = ["feetech-servo-sdk>=1.0.0", "pynput>=1.7.7"]
 intelrealsense = ["pyrealsense2>=2.55.1.6486 ; sys_platform != 'darwin'"]
-pi0 = ["transformers>=4.48.0"]
 pusht = ["gym-pusht>=0.1.5 ; python_version < '4.0'"]
 stretch = [
     "hello-robot-stretch-body>=0.7.27 ; python_version < '4.0' and sys_platform == 'linux'",