bump tensorflow to 2.4.1

[lazyoracle]

• bump tensorflow to 2.4.1 (ref Illegal instruction (core dumped) in a CPU with AVX support tensorflow/tensorflow#45744)
• update dependencies and language in pre-commit config

[codecov-io]

Codecov Report

Merging #72 (7c795d4) into dev (3c833cf) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev      #72   +/-   ##
=======================================
  Coverage   47.65%   47.65%           
=======================================
  Files          36       36           
  Lines        4707     4707           
=======================================
  Hits         2243     2243           
  Misses       2464     2464           

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