update sdk and demos to ray 2.5

[MichaelClifford]

I walked through each of the demos using a Ray 2.5 image and updating the driver environment to use Ray 2.5. Everything seemed to work without issue.

This PR updates all the requirements to point to Ray 2.5.0 instead of 2.1.0.

It also updates the default image in the cluster config to "rayproject/ray:2.5.0-py38-cu116"

I also used the image parameter in all of the cluster config calls just to make it more explicit that the image is configurable.

closes #134

[KPostOffice]

Don't some of the examples need PyTorch installed now since it is no longer present by default in the image? Otherwise this LGTM at first glance.

[jbusche]

Testing all the notebooks, and I'm noticing trouble with 2 of them:
3_basic_interactive.ipynb and hf_interactive.ipynb, at the assert ray_cluster_uri, step they're complaining about

AttributeError: 'JobConfig' object has no attribute '_py_driver_sys_path'

I want to try now with with the regular code and see if it's the same there, or maybe I'm doing something wrong... not sure.

[MichaelClifford]

@KPostOffice the notebook image still contains pytorch. It gets installed with the rest of our requirements.

[MichaelClifford]

@jbusche are you using ray 2.5 in your working environment? I had the same issue if I did not use the right version of Ray

[tedhtchang]

This PR also fixes #170

[jbusche]

LGTM Michael showed me how to update the Ray version in the notebook:

• Open a terminal
• Issue the following pip commands:

pip list |grep ray
ray                      2.1.0
....
pip install -U ray==2.5.0
....
pip list |grep ray
ray                      2.5.0

And then restart any running notebooks

All the notebooks worked well after that. Thanks Michael!

[jbusche]

LGTM

[anishasthana]

Need to substitute an image in a few locations

[jbusche]

Looks good Michael, Images pulling fine:

oc get appwrapper
NAME        AGE
mnisttest   3m46s
[[email protected] ~]# oc describe pods |grep Image:
    Image:         quay.io/project-codeflare/ray:2.5.0-py38-cu116
    Image:         busybox:1.28
    Image:         quay.io/project-codeflare/ray:2.5.0-py38-cu116
    Image:         quay.io/project-codeflare/ray:2.5.0-py38-cu116
    Image:         busybox:1.28
    Image:         quay.io/project-codeflare/ray:2.5.0-py38-cu116
    Image:         quay.io/project-codeflare/ray:2.5.0-py38-cu116