Remove pillow from dependencies

[AleksanderWWW]

Before submitting checklist

• Did you update the CHANGELOG? (not for test updates, internal changes/refactors or CI/CD setup)
• Did you ask the docs owner to review all the user-facing changes?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.94%. Comparing base (1de1f64) to head (39d4bb7).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1745      +/-   ##
==========================================
- Coverage   75.32%   74.94%   -0.38%     
==========================================
  Files         244      244              
  Lines       13036    13036              
==========================================
- Hits         9819     9770      -49     
- Misses       3217     3266      +49     

Flag	Coverage Δ
e2e	61.98% <100.00%> (ø)
e2e-management	55.72% <0.00%> (-0.03%)	⬇️
e2e-s3	52.91% <0.00%> (-0.01%)	⬇️
e2e-s3-gcs	52.91% <0.00%> (-0.01%)	⬇️
e2e-standard	61.97% <100.00%> (ø)
macos	61.92% <100.00%> (-13.34%)	⬇️
py3.10	?
py3.11	?
py3.12	62.50% <100.00%> (-13.42%)	⬇️
py3.7	74.38% <100.00%> (-0.26%)	⬇️
py3.7.16	61.14% <100.00%> (-13.43%)	⬇️
py3.8	?
py3.9	?
ubuntu	74.89% <100.00%> (-0.38%)	⬇️
unit	71.89% <100.00%> (-1.14%)	⬇️
windows	73.51% <100.00%> (-0.37%)	⬇️

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[AleksanderWWW]

E2E ✅

https://github.com/neptune-ai/neptune-client/actions/runs/8718383909

[szysad]

whats the reason for getting rid of PIL importskip in favor of dynamic import

[AleksanderWWW]

importskip seems to work only in test files that are not imported later on. Here's a utils file that's not directly tested. The result of using importskip here was an error:
https://github.com/neptune-ai/neptune-client/actions/runs/8717801814/job/23914764348

[szysad]

One more important thing. Shouldn't Pillow be now added to dev_requirements.txt so tests that use Pillow are not skipped?