chore(deps): update github.com/stretchr/testify to v1.8.4

[hazzik]

Update github.com/stretchr/testify to v1.8.4 to remove circular dependency on github.com/stretchr/objx

[cleptric]

Thanks for the PR. Any reason not to use 1.10?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.00%. Comparing base (7f4ff0a) to head (c7dc78e).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #988      +/-   ##
==========================================
+ Coverage   83.94%   84.00%   +0.05%     
==========================================
  Files          50       50              
  Lines        5171     5171              
==========================================
+ Hits         4341     4344       +3     
+ Misses        675      673       -2     
+ Partials      155      154       -1     

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[hazzik]

@cleptric, no particular reason. Was not sure on the package update policy, so just bumped to minimal version where the circular dependency issue was solved.