[x] fix clippy errors in tests that were not marked before
[x] Update version of "derive_more"
Testing
[x] The documentation does not change a lot as the previous formulation passed the same way, but was simply flagged by clippy. (But now the doc-comments in the code are better to read)
Description
This PR corrects newly marked warnings by clippy that were introduced by recent updates of clippy.
Testing
Checklist: