fix flaky staking integration test

[codchen]

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TSIA

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integration test

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jan 8, 2026, 2:55 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.81%. Comparing base (4107264) to head (dcf1feb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2674      +/-   ##
==========================================
+ Coverage   43.79%   43.81%   +0.01%     
==========================================
  Files        1908     1908              
  Lines      159047   159047              
==========================================
+ Hits        69659    69682      +23     
+ Misses      82981    82954      -27     
- Partials     6407     6411       +4     

Flag	Coverage Δ
sei-chain	45.88% <ø> (-0.01%)	⬇️
sei-cosmos	38.20% <ø> (-0.01%)	⬇️
sei-db	69.13% <ø> (ø)
sei-tendermint	47.28% <ø> (+0.08%)	⬆️

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see 15 files with indirect coverage changes

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