bump sei-tendermint to v0.4.3 for improving blocksync and p2p issue

[blindchaser]

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Testing performed to validate your change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.33%. Comparing base (dd940e5) to head (4c1ef77).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1915      +/-   ##
==========================================
- Coverage   61.35%   61.33%   -0.03%     
==========================================
  Files         263      263              
  Lines       23328    23328              
==========================================
- Hits        14314    14308       -6     
- Misses       8009     8016       +7     
+ Partials     1005     1004       -1     

see 2 files with indirect coverage changes