Replace toString

[anhdevit]

Addresses #7747
@medikoo Hello, sorry for previous PR. I closed previous PR. Could you check for me?

[codecov-commenter]

Codecov Report

Merging #7893 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #7893   +/-   ##
=======================================
  Coverage   88.43%   88.43%           
=======================================
  Files         244      244           
  Lines        9057     9057           
=======================================
  Hits         8010     8010           
  Misses       1047     1047           

Impacted Files	Coverage Δ
lib/plugins/aws/deployFunction/index.js	90.35% <100.00%> (ø)
lib/plugins/aws/package/compile/functions/index.js	97.05% <100.00%> (+0.01%)	⬆️
lib/plugins/create/create.js	90.69% <100.00%> (-0.11%)	⬇️

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[medikoo]

Looks good @anhdevit Thank you!