chore: release v9.0.0

[github-actions]

🤖 New release

• system-deps-meta: 8.0.0 -> 9.0.0 (✓ API compatible changes)
• system-deps: 8.0.0 -> 9.0.0 (⚠ API breaking changes)

⚠ system-deps breaking changes

--- failure constructible_struct_adds_field: externally-constructible struct adds field ---

Description:
A pub struct constructible with a struct literal has a new pub field. Existing struct literals must be updated to include the new field.
        ref: https://doc.rust-lang.org/reference/expressions/struct-expr.html
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.48.0/src/lints/constructible_struct_adds_field.ron

Failed in:
  field Library.link_files in /tmp/.tmpBdUfFG/system-deps/src/lib.rs:1204

Changelog

system-deps-meta

9.0.0 - 2026-08-14

Other

• Fix broken changelog compare links for 8.0.0

system-deps

9.0.0 - 2026-08-14

Fixed

• unset TARGET and PKG_CONFIG_ALLOW_CROSS after pkg-config has read them
• don't emit duplicate rustc-link-search lines
• add some information about what's happening with the new target arg to gen_flags

Other

• Reuse pkg_config v0.3.34's Library::extract_lib_from_filename
• Test static/target build with link_files
• Support pkg-config-rs link_files on static/target builds
• Remove release-drafter (superseded by release-plz)
• Fix broken changelog compare links for 8.0.0

---

This PR was generated with release-plz.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.64%. Comparing base (b5d008d) to head (a0cfe17).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #147   +/-   ##
=======================================
  Coverage   92.64%   92.64%           
=======================================
  Files           8        8           
  Lines        3564     3564           
=======================================
  Hits         3302     3302           
  Misses        262      262           

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