Bump pytest version

[d-a-bunin]

Before submitting (must do checklist)

• Did you read the contribution guide?
• Did you update the docs? We use Numpy format for all the methods and classes.
• Did you write any new necessary tests?
• Did you update the CHANGELOG?

Proposed Changes

• Bump pytest version to handle warnings properly

Closing issues

[github-actions]

🚀 Deployed on https://deploy-preview-105--etna-docs.netlify.app

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (3791c4a) 89.24% compared to head (39d750a) 89.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
- Coverage   89.24%   89.21%   -0.04%     
==========================================
  Files         195      195              
  Lines       12596    12615      +19     
==========================================
+ Hits        11241    11254      +13     
- Misses       1355     1361       +6     

Files	Coverage Δ
etna/auto/auto.py	95.69% <100.00%> (ø)
etna/commands/forecast_command.py	94.93% <100.00%> (-0.07%)	⬇️
etna/datasets/tsdataset.py	93.21% <100.00%> (ø)
etna/datasets/utils.py	96.70% <100.00%> (ø)
etna/models/sarimax.py	97.75% <100.00%> (ø)
etna/models/tbats.py	95.71% <100.00%> (+0.45%)	⬆️
etna/models/utils.py	91.89% <100.00%> (ø)
...ansforms/decomposition/change_points_based/base.py	95.29% <100.00%> (ø)
.../decomposition/change_points_based/segmentation.py	95.12% <100.00%> (ø)
...nsforms/decomposition/change_points_based/trend.py	100.00% <ø> (ø)
... and 2 more

... and 3 files with indirect coverage changes

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[martins0n]

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