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]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ 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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