Add `codeSubstitutes` to rococo parachains (#4669)
Since the fix for https://github.com/paritytech/polkadot-sdk/issues/4559 was to add a codeSubstitute to the rococo-parachains, we should update the chain-specs in the repo. The json diffs are not super easy to review, so if you want to manually check: - Run for example `jd -o people-rococo.diff people-rococo-from-this-branch.json people-rococo-master.json` - Check in the resulting diff file that only `codeSubstitutes` field is changed