Clearing process dictionary breaks on some keys

[chrismccord]

ref: phoenixframework/phoenix#5807

[ryanwinchester]

The error is from the to_string/1 on the key which can be term (not just string or atom), and it's getting a tuple
(e.g. {MyApp.Repo, :dynamic_repo}).

bandit/lib/bandit/http1/handler.ex

Line 37 in bb159d4

if !match?("$" <> _, to_string(key)), do: Process.delete(key)

[mtrudel]

Oh dang. Patching this directly.