update random-access-*

[FreddieRidell]

Feature Request

Summary

Update to the most recent versions of the random-access-* packages

Motivation

• Always good to keep up-to-date
• RandomAccess trait contains len function, which seems to be required by Remove Feed Builder in favor of Feed simple create function #72

Unresolved Questions

Is there some reason this hasn't been done already? Are these packages in a state of flux? Are there any known issues which make this hard/impossible

[yoshuawuyts]

Are these packages in a state of flux?

The changes introduced in the random-access packages were mostly on substack's request. I see no harm in upgrading currently.

That said we're exploring how to make them available using async interfaces as that space moves along. But that shouldn't be a blocker for this.

[FreddieRidell]

resolved by #77