Fixed flaky p2p test

[pompon0]

MConnection.sendRoutine() was incorrectly returning DeadlineExceeded in case flushing timer returned at the moment the context was cancelled (context error should be returned instead).

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jan 27, 2026, 2:32 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.90%. Comparing base (e3db226) to head (d5b48b9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2774      +/-   ##
==========================================
+ Coverage   52.19%   56.90%   +4.71%     
==========================================
  Files        1961     2004      +43     
  Lines      156771   164645    +7874     
==========================================
+ Hits        81826    93699   +11873     
+ Misses      67297    62728    -4569     
- Partials     7648     8218     +570     

Flag	Coverage Δ
sei-chain	41.73% <0.00%> (-0.01%)	⬇️
sei-cosmos	48.13% <ø> (?)
sei-db	68.72% <ø> (ø)
sei-tendermint	58.62% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sei-tendermint/internal/p2p/conn/connection.go	92.00% <100.00%> (ø)

... and 431 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.