[BUG] Could not install PennyLane-Lightning-GPU using pip install pennylane-lightning[gpu]

[derange-alembic]

Expected behavior

Running pip install pennylane-lightning[gpu] and get lightning.gpu installed.

Actual behavior

When installing through pip:
Requirement already satisfied: pennylane-lightning[gpu] in /home/cuquantum/conda/envs/cuquantum-23.06/lib/python3.9/site-packages (0.32.0) WARNING: pennylane-lightning 0.32.0 does not provide the extra 'gpu'

When running dev = qml.device("lightning.gpu", wires=nq, batch_obs=True) in Python script:
pennylane._device.DeviceError: Device lightning.gpu does not exist. Make sure the required plugin is installed.

Additional information

I have to install through pip install PennyLane-Lightning-GPU and it works.

Source code

pip install pennylane-lightning[gpu]

Tracebacks

Requirement already satisfied: pennylane-lightning[gpu] in /home/cuquantum/conda/envs/cuquantum-23.06/lib/python3.9/site-packages (0.32.0)
WARNING: pennylane-lightning 0.32.0 does not provide the extra 'gpu'

System information

Below actually shows the system info after I installed the gpu plugin with `pip install PennyLane-Lightning-GPU`

----------

Name: PennyLane
Version: 0.32.0
Summary: PennyLane is a Python quantum machine learning library by Xanadu Inc.
Home-page: https://github.com/PennyLaneAI/pennylane
Author:
Author-email:
License: Apache License 2.0
Location: /home/cuquantum/conda/envs/cuquantum-23.06/lib/python3.9/site-packages
Requires: appdirs, autograd, autoray, cachetools, networkx, numpy, pennylane-lightning, requests, rustworkx, scipy, semantic-version, toml, typing-extensions
Required-by: PennyLane-Lightning, PennyLane-Lightning-GPU

Platform info:           Linux-5.15.0-84-generic-x86_64-with-glibc2.31
Python version:          3.9.16
Numpy version:           1.23.5
Scipy version:           1.11.1
Installed devices:
- default.gaussian (PennyLane-0.32.0)
- default.mixed (PennyLane-0.32.0)
- default.qubit (PennyLane-0.32.0)
- default.qubit.autograd (PennyLane-0.32.0)
- default.qubit.jax (PennyLane-0.32.0)
- default.qubit.tf (PennyLane-0.32.0)
- default.qubit.torch (PennyLane-0.32.0)
- default.qutrit (PennyLane-0.32.0)
- null.qubit (PennyLane-0.32.0)
- lightning.gpu (PennyLane-Lightning-GPU-0.32.0)
- lightning.qubit (PennyLane-Lightning-0.32.0)

Existing GitHub issues

• I have searched existing GitHub issues to make sure the issue does not already exist.

[mlxd]

Hi @derange-alembic

Thanks for reporting this. We have an attached PR that will rectify this, which will be resolved with our next release of PennyLane. For now, we can suggest using pip install pennylane-lightning-gpu to explicitly install the package.