Release v0.68.1

[jansegre]

Changes

• fix(nano): runtime type restriction for emit_event syscall #1506
• fix(nano): state API regression when requesting dict fields #1507

Release-candidates

• Release-candidate v0.68.1-rc.1 #1508

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 86.24%. Comparing base (4615e9a) to head (c609757).
⚠️ Report is 6 commits behind head on release.

Additional details and impacted files

@@           Coverage Diff            @@
##           release    #1509   +/-   ##
========================================
  Coverage    86.24%   86.24%           
========================================
  Files          440      440           
  Lines        34055    34063    +8     
  Branches      5326     5328    +2     
========================================
+ Hits         29371    29378    +7     
+ Misses        3664     3663    -1     
- Partials      1020     1022    +2     

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