Bump Geth to v1.15.7-sei-2 and set request size limit to 10MB

[yzang2019]

Describe your changes and provide context

Simply bump Geth to next version to include sei-protocol/go-ethereum#62 also upstream to ethereum/go-ethereum#32279 change and set websocket readLimit to prevent the OOM issue

Testing performed to validate your change

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 60.14%. Comparing base (93c867b) to head (c70f911).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
evmrpc/server.go	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2261      +/-   ##
==========================================
- Coverage   60.15%   60.14%   -0.02%     
==========================================
  Files         311      311              
  Lines       30095    30098       +3     
==========================================
- Hits        18103    18101       -2     
- Misses      10717    10718       +1     
- Partials     1275     1279       +4     

Files with missing lines	Coverage Δ
evmrpc/rpcstack.go	72.95% <100.00%> (+0.07%)	⬆️
evmrpc/server.go	87.35% <66.66%> (+0.14%)	⬆️

... and 5 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.