FIX: typeddict import bug

[martins0n]

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

Closing issues

[github-actions]

🚀 Deployed on https://deploy-preview-867--etna-docs.netlify.app

[codecov-commenter]

Codecov Report

Merging #867 (3040bd4) into master (61d9a80) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #867   +/-   ##
=======================================
  Coverage   84.75%   84.75%           
=======================================
  Files         132      132           
  Lines        7471     7471           
=======================================
  Hits         6332     6332           
  Misses       1139     1139           

Impacted Files	Coverage Δ
etna/models/nn/rnn.py	100.00% <100.00%> (ø)

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