Release v0.68.3

[jansegre]

Changes

• fix(indexes): iterating all mempool transactions could visit every block #1519
• fix(sync): do not count voided blocks towards repeated blocks limit #1520
• feat(mempool): Optimize mempool cleaning #1526
• fix: nc-fail should not count for excluding conflicts from mempool #1532

Release-candidates

• Release-candidate v0.68.3-rc.1 #1523
• Release-candidate v0.68.3-rc.2 #1525
• Release-candidate v0.68.3-rc.3 #1527

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.18%. Comparing base (e73f2a5) to head (c5a69f8).
⚠️ Report is 12 commits behind head on release.

Additional details and impacted files

@@             Coverage Diff             @@
##           release    #1524      +/-   ##
===========================================
- Coverage    86.25%   86.18%   -0.07%     
===========================================
  Files          437      437              
  Lines        33725    33725              
  Branches      5265     5267       +2     
===========================================
- Hits         29089    29067      -22     
- Misses        3624     3644      +20     
- Partials      1012     1014       +2     

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