Apply e08ff622c91a to 6.6.y

[Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>]

Hi Greg, Sasha,

Please consider applying commit e08ff622c91a to 6.6.y. It requires the
following chain:

    828176d037e2 ("rust: arc: add explicit `drop()` around `Box::from_raw()`")
    ae6df65dabc3 ("rust: upgrade to Rust 1.72.1")
    c61bcc278b19 ("rust: task: remove redundant explicit link")
    a53d8cdd5a0a ("rust: print: use explicit link in documentation")
    e08ff622c91a ("rust: upgrade to Rust 1.73.0")

which applies cleanly to 6.6.y. This upgrades the Rust compiler
version from 1.71.1 to 1.73.0 (2 version upgrades + 3 prerequisites
for the upgrades), fixing a couple issues with the Rust compiler
version currently used in 6.6.y. In particular:

  - A build error with `CONFIG_RUST_DEBUG_ASSERTIONS` enabled
(`.eh_frame` section unexpected generation). This is solved applying
up to ae6df65dabc3.

  - A developer-only Make target error (building `.rsi` single-target
files, i.e. the equivalent to requesting a preprocessed file in C).
This is solved applying all of them.

Thanks!

Cheers,
Miguel