fix(staking): add missing iterator.Close() calls

[jaramyweb3]

Two functions in x/staking/keeper/delegation.go were missing defer iterator.Close():

• IterateDelegatorRedelegations
• GetRedelegations

This causes resource leaks since iterators hold references to underlying storage.

All other 25+ iterator usages in the same file properly call defer iterator.Close() — these two were simply overlooked.

[aljo242]

could you please add a changelog entry for this?

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 70.43%. Comparing base (18e85de) to head (2ce972f).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
x/staking/keeper/delegation.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #25649      +/-   ##
==========================================
+ Coverage   70.40%   70.43%   +0.03%     
==========================================
  Files         830      830              
  Lines       54050    54052       +2     
==========================================
+ Hits        38052    38071      +19     
+ Misses      15998    15981      -17     

Files with missing lines	Coverage Δ
x/staking/keeper/delegation.go	75.03% <50.00%> (-0.07%)	⬇️

... and 3 files with indirect coverage changes

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[jaramyweb3]

sure, thanks