Release-candidate v0.67.1-rc.1

[jansegre]

Changes

• fix(nano): avoid exception when generating json #1421

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

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.10%. Comparing base (ab0558f) to head (3cfa5fb).
⚠️ Report is 2 commits behind head on release-candidate.

Files with missing lines	Patch %	Lines
hathor/transaction/headers/nano_header.py	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           release-candidate    #1480      +/-   ##
=====================================================
+ Coverage              86.06%   86.10%   +0.03%     
=====================================================
  Files                    437      437              
  Lines                  33966    33967       +1     
  Branches                5315     5316       +1     
=====================================================
+ Hits                   29234    29248      +14     
+ Misses                  3686     3677       -9     
+ Partials                1046     1042       -4     

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