use absolute imports

[tlambert03]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 93.75000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.93%. Comparing base (35ab43d) to head (768b3e3).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/proteins/util/importers.py	33.33%	2 Missing ⚠️
backend/proteins/util/spectra_import.py	0.00%	2 Missing ⚠️
backend/proteins/index.py	0.00%	1 Missing ⚠️
backend/references/index.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #391      +/-   ##
==========================================
- Coverage   61.97%   61.93%   -0.05%     
==========================================
  Files         114      114              
  Lines        9008     9008              
==========================================
- Hits         5583     5579       -4     
- Misses       3425     3429       +4     

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