Fix CI test

[leckylao]

• increase stake behaviour SNX mint
• update setRate to deploy mockAggregator

[codecov]

Codecov Report

Merging #1644 (1be5282) into develop (61eca39) will not change coverage.
The diff coverage is n/a.

❗ Current head 1be5282 differs from pull request most recent head bfd1b05. Consider uploading reports for the commit bfd1b05 to get more accurate results

@@           Coverage Diff            @@
##           develop    #1644   +/-   ##
========================================
  Coverage    95.58%   95.58%           
========================================
  Files           82       82           
  Lines         1904     1904           
  Branches       593      593           
========================================
  Hits          1820     1820           
  Misses          84       84           

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