fix: update to current version of rust

[kitplummer]

No description provided.

[kitplummer]

@radazzouz - I've updated this to current to make sure it works. Probably need to get this updated regularly if we're going to maintain it. Or is this the domain of you @okdistribute?

[sl1pm4t]

We could use renovate bot to auto update the dependencies.

[okdistribute]

cc @nicholastmosher and @zmarkan , good low hanging fruit project here.

I created #149 -- the rust example should move to a different repository like the rest of the samples.