Type hint fix

[Kieran-Fishwick-TfN]

Describe Changes

updated multi tld API

Task Checklist

• [ ] Have unittests been added (testing individual functions and their edge cases)
• [ ] Have integration tests been added (if applicable, to test modules of functionality)
• [ ] Updated RELEASE.md to reflect changes in PR
• [ ] Is the documentation building correctly with a clean version number?
• [ ] Have new dependencies been added?
  • [ ] Have they been added to either requirements.txt or requirements_dev.txt.
  • [ ] Have they been added to setup.cfg

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 77.77778% with 26 lines in your changes missing coverage. Please review.

Project coverage is 85.29%. Comparing base (33cd564) to head (269942c). Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
src/caf/distribute/gravity_model/core.py	33.33%	14 Missing :warning:
src/caf/distribute/gravity_model/multi_area.py	87.23%	12 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #46 +/- ## ========================================== - Coverage 86.31% 85.29% -1.03% ========================================== Files 11 11 Lines 994 1047 +53 ========================================== + Hits 858 893 +35 - Misses 136 154 +18 ```

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