Migrate away from ioutil

[perdasilva]

Description of the change:

Migrates away from ioutil as its been deprecated since go1.16

Motivation for the change:

Reviewer Checklist

• [ ] Implementation matches the proposed design, or proposal is updated to match implementation
• [ ] Sufficient unit test coverage
• [ ] Sufficient end-to-end test coverage
• [ ] Docs updated or added to /docs
• [ ] Commit messages sensible and descriptive

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 57.50%. Comparing base (de37a21) to head (4bba1a0).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1865   +/-   ##
=======================================
  Coverage   57.50%   57.50%           
=======================================
  Files         136      136           
  Lines       12934    12934           
=======================================
  Hits         7438     7438           
  Misses       4341     4341           
  Partials     1155     1155           

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