Fix dependency checker workflow failure

[rwedge]

The dependency checker workflow is failing during its scheduled runs. Traceback of the error:

ruff check --fix .
error[D420]: Section "Returns" appears after section "Raises" but should be before it
   --> deepecho/sequences.py:173:5
    |
171 |             If context columns are not constant within each entity or segment.
172 |
173 |     Returns:
    |     ^^^^^^^
174 |         list:
175 |             List of ``pandas.DataFrames`` containing each segment.
    |

Found 1 error.
make: *** [Makefile:91: fix-lint] Error 1
Error: Process completed with exit code 2.