Auto merge of #137290 - matthiaskrgr:rollup-a7xdbi4, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - #120580 (Add `MAX_LEN_UTF8` and `MAX_LEN_UTF16` Constants)
 - #132268 (Impl TryFrom<Vec<u8>> for String)
 - #136093 (Match Ergonomics 2024: update old-edition behavior of feature gates)
 - #136344 (Suggest replacing `.` with `::` in more error diagnostics.)
 - #136690 (Use more explicit and reliable ptr select in sort impls)
 - #136815 (CI: Stop /msys64/bin from being prepended to PATH in msys2 shell)
 - #136923 (Lint `#[must_use]` attributes applied to methods in trait impls)
 - #137155 (Organize `OsString`/`OsStr` shims)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors