ref(py3): Correct digests interface for py3 redis (#20575)
ref(py3): Correct digests interface for py3 redis (#20575)

Redis will return bytes now, so we simply decode the key in the two
places it comes back from the digests scripts.

The digest codec handles things in bytes, so that didn't have to change
beeftornado/sentry,beeftornado/sentry,beeftornado/sentry