chore(deps): bump iavl to initia-labs/iavl v1.2.8-initia.1

[traviolus]

Description

Closes: #XXXX

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Author Checklist

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• reviewed state machine logic, API design and naming, documentation is accurate, tests and test coverage

[coderabbitai]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.20%. Comparing base (1a757aa) to head (648f883).
⚠️ Report is 27 commits behind head on release/v1.4.x.

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/v1.4.x     #533      +/-   ##
==================================================
+ Coverage           38.02%   38.20%   +0.18%     
==================================================
  Files                 325      325              
  Lines               30765    30855      +90     
==================================================
+ Hits                11697    11789      +92     
+ Misses              17185    17176       -9     
- Partials             1883     1890       +7     

Files with missing lines	Coverage Δ
app/abcipp.go	67.39% <100.00%> (+2.68%)	⬆️

... and 7 files with indirect coverage changes

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