Don't use `he` to decode response

Created by: eseliger

This seems to work just fine, so I don't think we need it. Does someone know what it's used for? This dependency ends up in the main bundle and is somewhat large, so if we can get rid of it, it'd give us a small boost in app startup :)

Slack thread discussing this: https://sourcegraph.slack.com/archives/C01C3NCGD40/p1618846084064600