Update Dockerfile

[peterdudfield]

Pull Request

Description

Update to python 312

https://github.com/openclimatefix/ocf-infrastructure/issues/373

How Has This Been Tested?

CI tests

• [ ] Yes

Checklist:

• [ ] My code follows OCF's coding style guidelines
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (982bb8e) 95.38% compared to head (f31ca55) 95.38%. Report is 1 commits behind head on main.

:exclamation: Current head f31ca55 differs from pull request most recent head f6bc4d5. Consider uploading reports for the commit f6bc4d5 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #134 +/- ## ======================================= Coverage 95.38% 95.38% ======================================= Files 11 11 Lines 629 629 ======================================= Hits 600 600 Misses 29 29 ```

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