As we cannot just use the `?` operator anymore since `check_user_presence`
doesn't return a Tock error (cf. e1c6aca7), we need to create match of the result
which in turn moves it, thus we cannot use a temporary closure anymore but need
an assignment.

Cf. the pull https://github.com/tock/libtock-rs/pull/131, specifically the
changes

* https://github.com/tock/libtock-rs/pull/131/files#diff-431b238bab5245843aa5ac7edf249f7bL58
* https://github.com/tock/libtock-rs/pull/131/files#diff-f08a2946da590a5e9b304f0b55b87608L23

unwrap only works if the error value implements Debug, however since the
buttons subsystem doesn't return TockValue<E> but TockError this isn't the case
(anymore).  In theory one should think about refactoring check_user_presence()
to return TockResult<()> and possibly implementing some way for Ctap2StatusCode
to be converted to TockError enums or similar.  Then we can just pass errors
up the stack instead of panicking early.

replace TockValue with TockReturn and replace timer::with_callback to timer::DriverContext::with_callback (and create context)

Update reproducible hashes

Support parsing old credentials

Add GitHub workflow to check that binaries are reproducible.