{examples,tests}/rust: Rust updates (-sys/-wrappers version, stable)

[chrysn]

Contribution description

Another round of updates to the Rust examples, with the usual steps of

• updating versions and
• following all the latest riot-wrappers deprecations (so that going through a breaking version will be painless),

with extas of

• increasing the stack size (cherry-picked from examples/rust-gcoap: Add SAUL #17554 -- turned out some resources' rendering overflew the stack), and
• documenting it's now usable in some cases with stable Rust.

Disabling default-features on two examples sits somewhere between them -- the deprecation note says only that we have to pull in those that were default so far, but it is necessary to make things work on stable unmodified.

Testing procedure

• Green CI (which includes tests)
• Optionally, make all term CARGO_CHANNEL=stable BOARD=microbit-v2 all flash term -C examples/rust-hello-world (if you have Rust 1.59 at hand and all the relevant targets installed)

Issues/PRs references

Closes #17526

Includes a cherry-pick from #17554

Once this is through, I can open one at https://arewertosyet.com/ to make our "compiles on stable" checkbox go green.

[benpicco]

Please squash!

[chrysn]

If it's OK with you I'll add one more cargo update run at squash time, which will then also cover the 0.7.19 version of riot-wrappers which I'm about to release, which will then also work both before and after #17544 (and thus that PR can be rebased onto this and will not need to contain any Rust changes any more)

[chrysn]

The first quashed push was erroneous as it still had a local override in place -- would probably have gone through just fine, and worked, but that would have circumvented the checks that are in place in Cargo.lock against crates.io corruption.

The new is good (as can be seen by loading the Cargo.toml diffs -- they show changed versions and hashes but nothing structural), and awaiting Murdock's OK to go through.