Tracking issue for release notes of #132402: Remove support for decompressing dylib metadata

[rustbot]

This issue tracks the release notes text for #132402.

Steps

• Proposed text is drafted by PR author (or team) making the noteworthy change.
• Issue is nominated for release team review of clarity for wider audience.
• Release team includes text in release notes/blog posts.

Release notes text

The responsible team for the underlying change should edit this section to replace the automatically generated link with a succinct description of what changed, drawing upon text proposed by the author (either in discussion or through direct editing).

# Compatibility notes
- [Remove support for older dylibs from rust-analyzer proc macros](https://github.com/rust-lang/rust/pull/132402)

Tip

Use the previous releases categories to help choose which one(s) to use.
The category will be de-duplicated with all the other ones by the release team.

More than one section can be included if needed.

Release blog section

If the change is notable enough for inclusion in the blog post, the responsible team should add content to this section.
Otherwise leave it empty.

cc @bjorn3, @jieyouxu -- origin issue/PR authors and assignees for starting to draft text

[Noratrieb]

the only user-affecting change here is the rust-analyzer proc macro server, but i'm unsure whether that's even worth pointing out

[jieyouxu]

Feel free to close if this is not worth even the compat notes, opened just in case.

[bjorn3]

Probably not worth it. The only case where this can even show up at all is if you compiled a dylib with a rustc version that is well over a year old and accidentally try to load it with a rustc version from after this PR, in which case you get a slightly worse diagnostic.