fix(deps): remediate CVE-2026-26314 in go-ethereum

[rogarcia]

Summary

• upgrade github.com/ethereum/go-ethereum from v1.16.8 to v1.16.9
• run lint, build, tests, and govulncheck verification locally
• update local .cve-report.xml by removing the remediated package entry

Verification

• $(go env GOPATH)/bin/golangci-lint run
• make build
• make test
• go run golang.org/x/vuln/cmd/govulncheck@latest ./...

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 15.31%. Comparing base (5e7ea7e) to head (cbf831a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #340   +/-   ##
=======================================
  Coverage   15.31%   15.31%           
=======================================
  Files          52       52           
  Lines        6112     6112           
=======================================
  Hits          936      936           
  Misses       5131     5131           
  Partials       45       45           

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