Some linting improvments

[je-cook]

Description

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 55.81395% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.27%. Comparing base (f2b472d) to head (91682c7).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
process/models/vacuum.py	43.00%	57 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4491      +/-   ##
==========================================
- Coverage   49.37%   49.27%   -0.10%     
==========================================
  Files         151      151              
  Lines       29529    29599      +70     
==========================================
+ Hits        14581    14586       +5     
- Misses      14948    15013      +65     

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