Test latest openff-toolkit with gufe `main`

[codecov[bot]]

Codecov Report

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

Comparison is base (9f5795b) 98.98% compared to head (a664fba) 98.98%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #281 +/- ## ======================================= Coverage 98.98% 98.98% ======================================= Files 36 36 Lines 1966 1966 ======================================= Hits 1946 1946 Misses 20 20 ```

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[mattwthompson]

FYI we launched 0.15.2 on Friday, don't anticipate any changes with the public API