`cargo check` fails because `human-panic` and `sysinfo` require at least
1.88.0.
+++ command cargo check --release --locked --all-targets
error: rustc 1.85.0 is not supported by the following packages:
human-panic@2.0.6 requires rustc 1.88
sysinfo@0.37.2 requires rustc 1.88
Bump MSRV to fix this.
1.88.0 introduced [let chains], which in turn has `clippy` warn about
nested if statements. All of these sites are fixed in this change.
1.87.0 introduced [`is_multiple_of`], which is a more readable version
of `x % y == 0`.
[let chains]: https://blog.rust-lang.org/2025/06/26/Rust-1.88.0/#let-chains
[`is_multiple_of`]: https://doc.rust-lang.org/std/primitive.usize.html#method.is_multiple_of
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