Release v0.67.1

[jansegre]

Changes

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

Release-candidates

• Release-candidate v0.67.1-rc.1 #1480

Link here the release-candidates that were deployed as part of this release

Checklist

• I've read and followed the release process described in https://github.com/HathorNetwork/ops-tools/blob/master/docs/release-guides/hathor-core.md#stable-release
• The QA process was run successfully during the tests of the corresponding release-candidate(s)

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.09%. Comparing base (ab0558f) to head (21ab64a).
⚠️ Report is 3 commits behind head on release.

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    #1481      +/-   ##
===========================================
+ Coverage    86.06%   86.09%   +0.02%     
===========================================
  Files          437      437              
  Lines        33966    33967       +1     
  Branches      5315     5316       +1     
===========================================
+ Hits         29234    29244      +10     
+ Misses        3686     3680       -6     
+ Partials      1046     1043       -3     

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