Bump mergo to v1.0.0 with new module URL

[harryzcy]

github.com/imdario/mergo becomes dario.cat/mergo: https://github.com/darccio/mergo/releases/tag/v1.0.0

The author's GitHub handle is changed, see announcements from https://github.com/darccio/mergo/releases/tag/v0.3.16

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.41%. Comparing base (5a80a04) to head (6c06438).
Report is 95 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2403       +/-   ##
===========================================
+ Coverage   61.56%   76.41%   +14.84%     
===========================================
  Files          53       61        +8     
  Lines        9002     7919     -1083     
===========================================
+ Hits         5542     6051      +509     
+ Misses       3020     1310     -1710     
- Partials      440      558      +118     

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