Fixup ci errors. Clippy on beta channel is broken

[baloo]

Clippy on beta is broken and reports like:

error: cannot find macro `pre_install_msg_template!` in this scope
  --> src/cli/self_update.rs:98:9
   |
98 |         pre_install_msg_template!(
   |         ^^^^^^^^^^^^^^^^^^^^^^^^

error: cannot find macro `pre_install_msg_template!` in this scope
   --> src/cli/self_update.rs:109:9
    |
109 |         pre_install_msg_template!(
    |         ^^^^^^^^^^^^^^^^^^^^^^^^

error: cannot find macro `pre_install_msg_template!` in this scope
   --> src/cli/self_update.rs:118:9
    |
118 |         pre_install_msg_template!(
    |         ^^^^^^^^^^^^^^^^^^^^^^^^

warning: unused macro definition
  --> src/cli/self_update.rs:62:1
   |
62 | / macro_rules! pre_install_msg_template {
63 | |     ($platform_msg: expr) => {
64 | |         concat!(
65 | |             r"
...  |
93 | |     };
94 | | }
   | |_^
   |
   = note: `#[warn(unused_macros)]` on by default

This does not happens on neither stable nor nightly channel.

[kinnison]

Hi,

We are very aware that beta's clippy is current broken. We deliberately left our clippy job on the beta channel to provide a warning mechanism for us to detect issues coming down the pipe in the next release. Indeed this caused us to report and track an issue in the compiler.

The fix hit nightly from rust-lang/rust#63717 and we're waiting on a beta backport for now.

Thanks again for your contribution, but we won't be taking this at this time.

[baloo]

makes sense.