Release-candidate v0.68.3-rc.2

[jansegre]

Changes

• feat(mempool): Optimize mempool cleaning #1526

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 86.14%. Comparing base (2c11a1a) to head (d929a7c).
⚠️ Report is 2 commits behind head on release-candidate.

Additional details and impacted files

@@                  Coverage Diff                  @@
##           release-candidate    #1525      +/-   ##
=====================================================
- Coverage              86.29%   86.14%   -0.16%     
=====================================================
  Files                    437      437              
  Lines                  33732    33724       -8     
  Branches                5269     5267       -2     
=====================================================
- Hits                   29109    29051      -58     
- Misses                  3615     3655      +40     
- Partials                1008     1018      +10     

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