Update base_model.py

[peterdudfield]

Pull Request

Description

Fix targets to target pin ocf_datapipes to 2.3.1 until upgrades are made for 3.0.0

Helps with https://github.com/openclimatefix/PVNet-summation/pull/13

How Has This Been Tested?

CI tests

• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] 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
• [x] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (48a282a) 50.85% compared to head (cf0c21c) 50.85%. Report is 2 commits behind head on main.

Files	Patch %	Lines
pvnet/models/base_model.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #110 +/- ## ======================================= Coverage 50.85% 50.85% ======================================= Files 26 26 Lines 1701 1701 ======================================= Hits 865 865 Misses 836 836 ```

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