DM-37552: Remove unnecessary lsstimport import

[timj]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Base: 80.77% // Head: 80.70% // Decreases project coverage by -0.07% ⚠️

Coverage data is based on head (4e9cb57) compared to base (699de5b).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #300      +/-   ##
==========================================
- Coverage   80.77%   80.70%   -0.07%     
==========================================
  Files          58       58              
  Lines        6345     6345              
  Branches     1179     1179              
==========================================
- Hits         5125     5121       -4     
- Misses        979      981       +2     
- Partials      241      243       +2     

Impacted Files	Coverage Δ
python/lsst/pipe/base/graph/_implDetails.py	44.27% <0.00%> (ø)
tests/test_quantumGraph.py	95.33% <0.00%> (-0.67%)	⬇️
python/lsst/pipe/base/graph/graph.py	81.62% <0.00%> (-0.53%)	⬇️

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