fix(deps): update dependency @tensorflow/tfjs-node to v2.8.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@tensorflow/tfjs-node	2.6.0 -> 2.8.6

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[codecov]

Codecov Report

Merging #12 (3ebb956) into master (98473ac) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #12   +/-   ##
======================================
  Coverage    3.91%   3.91%           
======================================
  Files          90      90           
  Lines        3528    3528           
  Branches      574     574           
======================================
  Hits          138     138           
  Misses       3387    3387           
  Partials        3       3           

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