Update Gymnasium to 1.0.0a1 and remove Atari in favour of ale-py new gymnasium implementation

[pseudo-rnd-thoughts]

Description

With Gymnasium releasing 1.0.0a1, this PR updates Shimmy to work with it, removing atari support in the process as ale-py >= 0.9.0 will support it

[pseudo-rnd-thoughts]

Meltingpot is broken due to Chex update (google-deepmind/meltingpot#221) and they haven't released a new pip install yet.
Therefore, we can either install the git project or wait and hope for a release

[pseudo-rnd-thoughts]

dm-lab is failing due to problems loading a shared object file
meltingpot is failing due to chex limitation and no limitation on jax, waiting for new pip install

[elliottower]

Can’t we just use an older version of Chex and melting pot? Until they update it

[pseudo-rnd-thoughts]

@elliottower DM updated meltingpot so that issue is all fixed
The only issue is Dm-lab, any thoughts on what to do?

[elliottower]

@elliottower DM updated meltingpot so that issue is all fixed The only issue is Dm-lab, any thoughts on what to do?

If I get a chance in the next few days I can fire up my docker instance that has dm lab and test it, otherwise no idea honestly

[pseudo-rnd-thoughts]

If you can run the tests on the your machine locally that would be helpful
At worst, we can merge the PR and cut a release and clarify that dm-lab might be broken.