Release-candidate v0.66.0-rc.4

[jansegre]

Changes

• Nanocontracts should be disabled on mainnet for this release

Checklist

• I've read and followed the release candidate process described in https://github.com/HathorNetwork/ops-tools/blob/master/docs/release-guides/hathor-core.md#release-candidate
• I confirm this release candidate only includes production-ready changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.90%. Comparing base (ba67d32) to head (6e2e163).
⚠️ Report is 2 commits behind head on release-candidate.

Additional details and impacted files

@@                  Coverage Diff                  @@
##           release-candidate    #1432      +/-   ##
=====================================================
+ Coverage              85.83%   85.90%   +0.06%     
=====================================================
  Files                    430      430              
  Lines                  33227    33227              
  Branches                5204     5204              
=====================================================
+ Hits                   28520    28543      +23     
+ Misses                  3669     3650      -19     
+ Partials                1038     1034       -4     

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