Update HH dev dep & fix Zeppelin E2E test

[cgewecke]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 78.57% and project coverage change: -0.26% ⚠️

Comparison is base (4c63612) 95.90% compared to head (8274923) 95.65%.
Report is 14 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #811      +/-   ##
==========================================
- Coverage   95.90%   95.65%   -0.26%     
==========================================
  Files          19       19              
  Lines        1050     1058       +8     
==========================================
+ Hits         1007     1012       +5     
- Misses         43       46       +3     

Files Changed	Coverage Δ
lib/api.js	97.59% <50.00%> (-0.59%)	⬇️
plugins/resources/nomiclabs.utils.js	87.62% <75.00%> (-1.39%)	⬇️
plugins/hardhat.plugin.js	94.54% <100.00%> (ø)

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