CI updated to new python

[scap3yvt]

Fixes #999

Proposed Changes

• all CI, docker and workflows updated to use python 3.12

Checklist

• CONTRIBUTING guide has been followed.
• PR is based on the current GaNDLF master .
• Non-breaking change (does not break existing functionality): provide as many details as possible for any breaking change.
• Function/class source code documentation added/updated (ensure typing is used to provide type hints, including and not limited to using Optional if a variable has a pre-defined value).
• Code has been blacked for style consistency and linting.
• If applicable, version information has been updated in GANDLF/version.py.
• If adding a git submodule, add to list of exceptions for black styling in pyproject.toml file.
• Usage documentation has been updated, if appropriate.
• Tests added or modified to cover the changes; if coverage is reduced, please give explanation.
• If customized dependency installation is required (i.e., a separate pip install step is needed for PR to be functional), please ensure it is reflected in all the files that control the CI, namely: python-test.yml, and all docker files [1,2,3].
• The logging library is being used and no print statements are left.

[github-actions]

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[sarthakpati]

The likely culprit is the zarr version [ref], which is probably too old for python 3.11.

[grenkoca]

It looks like the issue resolves if you pin numcodecs<0.16.0 in setup.py

See here: https://github.com/grenkoca/GaNDLF/actions/runs/14536564124/job/40786016202

I'm not officially a maintainer so @scap3yvt will need to verify and merge my PR scap3yvt#7

[scap3yvt]

@sarthakpati this PR is now ready (per our conversation, please disregard the MLCube workflow).

[sarthakpati]

Disregarding MLCubes entirely because of lack of support from MLCommons (last release as of writing this comment was back in 2023 [ref]).

[sarthakpati]

The CI is getting tested upto python 3.12 but the Docker images are built using 3.11 because the docker images are older and do not have proper support for 3.12. To ensure we get proper support, the base images need to be updated, which means we need to drop CUDA 11 support for our Docker images.

No issues with this PR, good to merge.