fix to Protocol keys after off v2.1.1 bump in gufe base settings

[richardjgowers]

following: https://github.com/OpenFreeEnergy/gufe/pull/304

Checklist

• [ ] Added a news entry

Developers certificate of origin

• [ ] I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[codecov[bot]]

Codecov Report

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

Project coverage is 91.37%. Comparing base (bb93f38) to head (fc02c11). Report is 23 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #823 +/- ## ========================================== - Coverage 94.12% 91.37% -2.75% ========================================== Files 133 134 +1 Lines 9767 9791 +24 ========================================== - Hits 9193 8947 -246 - Misses 574 844 +270 ``` | [Flag](https://app.codecov.io/gh/OpenFreeEnergy/openfe/pull/823/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenFreeEnergy) | Coverage Δ | | |---|---|---| | [fast-tests](https://app.codecov.io/gh/OpenFreeEnergy/openfe/pull/823/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenFreeEnergy) | `91.37% <100.00%> (?)` | | | [slow-tests](https://app.codecov.io/gh/OpenFreeEnergy/openfe/pull/823/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenFreeEnergy) | `?` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenFreeEnergy#carryforward-flags-in-the-pull-request-comment) to find out more.

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