fix(signer): removed bip39 dependency

[roxaneletourneau]

Bip 39 had unneeded translation files increasing the bundle size.

fix #1110

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[github-actions]

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[codecov-commenter]

Codecov Report

Merging #1336 (cc18e36) into master (d5f06f8) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1336      +/-   ##
==========================================
+ Coverage   79.42%   79.44%   +0.01%     
==========================================
  Files         187      188       +1     
  Lines        9916     9925       +9     
  Branches     2369     2371       +2     
==========================================
+ Hits         7876     7885       +9     
  Misses       2030     2030              
  Partials       10       10              

Impacted Files	Coverage Δ
packages/taquito-signer/src/mnemonicToSeedSync.ts	100.00% <100.00%> (ø)
packages/taquito-signer/src/taquito-signer.ts	96.42% <100.00%> (ø)

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