PyLightning now depends on tensorboardx (previously tensorboard)

[madtoinou]

Fixes #.

Summary

Pytorch-Lightning changed dependency from tensorboard to tensorboardX (PR #15728), propagating the change to darts.

Other Information

Looked for tensorboard import everywhere, only found it in the notebooks, I hope that I did not miss anything.

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Codecov Report

Base: 93.94% // Head: 93.93% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (cad3d28) compared to base (02eaad5).
Patch has no changes to coverable lines.

❗ Current head cad3d28 differs from pull request most recent head e4f731e. Consider uploading reports for the commit e4f731e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1386      +/-   ##
==========================================
- Coverage   93.94%   93.93%   -0.01%     
==========================================
  Files          80       80              
  Lines        8708     8696      -12     
==========================================
- Hits         8181     8169      -12     
  Misses        527      527              

Impacted Files	Coverage Δ
darts/timeseries.py	92.16% <0.00%> (-0.06%)	⬇️
...arts/models/forecasting/torch_forecasting_model.py	87.70% <0.00%> (-0.06%)	⬇️
darts/models/forecasting/block_rnn_model.py	98.24% <0.00%> (-0.04%)	⬇️
darts/models/forecasting/nhits.py	99.27% <0.00%> (-0.01%)	⬇️

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[hrzn]

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