chore: release v0.12.0

[github-actions]

🤖 New release

• async_http_range_reader: 0.11.0 -> 0.12.0 (⚠ API breaking changes)

⚠ async_http_range_reader breaking changes

--- failure enum_marked_non_exhaustive: enum marked #[non_exhaustive] ---

Description:
A public enum has been marked #[non_exhaustive]. Pattern-matching on it outside of its crate must now include a wildcard pattern like `_`, or it will fail to compile.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#attr-adding-non-exhaustive
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.50.0/src/lints/enum_marked_non_exhaustive.ron

Failed in:
  enum AsyncHttpRangeReaderError in /tmp/.tmpBfs4SC/async_http_range_reader/src/error.rs:6

Changelog

0.12.0 - 2026-09-03

Fixed

• Declare error type as non_exhaustive (#13)

Other

• pin release-plz action to a commit with cargo-semver-checks 0.50
• Fix clippy
• Keep cached ranges alive after the download task stops
• reject file lengths that do not fit in usize
• Return a terminal error when range downloads stop

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This PR was generated with release-plz.