chore: improve sei-chain maintenance path

[otjdiepluong]

Summary:

• Add or tighten focused edge-case tests or type assertions in mod_test.go, evmrpc/test.go related to CI, Docker, Kubernetes, build tooling, release automation; avoid docs-only changes and broad refactors.
• Keep the change narrow so it is straightforward to review.

Notes:

• I kept this scoped to the relevant implementation and tests.

[cursor]

PR Summary

Low Risk
Test-only change to mod_test.go; no runtime or dependency behavior is modified.

Overview
Adds TestIsBannedModule, a table-driven unit test for the existing isBannedModule helper used by the go.mod / go.sum banned-dependency checks.

It covers exact upstream paths, major-version suffixes (e.g. ibc-go/v6), prefix-only paths that must not be banned (e.g. tm-db), empty input, and unrelated modules—locking in the intended matching behavior without changing production code.

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