blocksim - increase http client transport settings

[metachris]

📝 Summary

Improve HTTP client transport settings for forwarding blocks to simulation

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✅ I have run these commands

• make lint
• make test-race
• go mod tidy
• I have seen and agree to CONTRIBUTING.md

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.62%. Comparing base (fd95e0c) to head (ff1234b).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #597      +/-   ##
==========================================
+ Coverage   30.55%   30.62%   +0.06%     
==========================================
  Files          41       41              
  Lines        6286     6292       +6     
==========================================
+ Hits         1921     1927       +6     
  Misses       4118     4118              
  Partials      247      247              

Flag	Coverage Δ
unittests	30.62% <100.00%> (+0.06%)	⬆️

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