fix(rpc): bind default json-rpc listen address to localhost (backport #1613)

[mergify]

This is an automatic backport of pull request #1613 done by Mergify.
Cherry-pick of 3587015 has failed:

On branch mergify/bp/release/v0.21.x/pr-1613
Your branch is up to date with 'origin/release/v0.21.x'.

You are currently cherry-picking commit 3587015b.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   go.mod
	modified:   gomod2nix.toml
	modified:   scripts/contract-test.sh
	modified:   scripts/ethermint-devnet.yaml
	modified:   scripts/integration-test-all.sh
	modified:   scripts/start.sh
	modified:   server/config/config.go
	modified:   tests/integration_tests/configs/default.jsonnet
	modified:   testutil/network/network.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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