otel: Update some rust crates

- rustls to fix a 'panic in `Acceptor::accept`'

That also requires an update to rustls-pki-types

- hashbrown

It's not clear that this is actually a problem for us and we have two
different versions in Cargo.lock, one which isn't vulnerable, but just
bump the other version anyway, if you try and remove it altogether it
gets added back...

Link: <https://rustsec.org/advisories/RUSTSEC-2024-0399.html>
Link: <https://github.com/nginx/unit/security/dependabot/11>
Closes: <#1503>
Signed-off-by: Andrew Clayton <[email protected]>