Remove unused imports

[deepsource-autofix]

No description provided.

[codecov]

Codecov Report

Merging #116 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #116      +/-   ##
==========================================
- Coverage   93.74%   93.73%   -0.02%     
==========================================
  Files          44       44              
  Lines        1823     1819       -4     
  Branches      296      296              
==========================================
- Hits         1709     1705       -4     
  Misses         69       69              
  Partials       45       45              

Flag	Coverage Δ
#unittests	93.73% <ø> (-0.02%)	⬇️

Impacted Files	Coverage Δ
src/labthings/json/encoder.py	86.66% <ø> (-0.84%)	⬇️
src/labthings/json/marshmallow_jsonschema/base.py	94.33% <ø> (-0.11%)	⬇️
src/labthings/sync/event.py	95.23% <ø> (-0.12%)	⬇️

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