Update dependencies, improve tests, bump to v2.0

[HEnquist]

No description provided.

[Copilot]

Pull request overview

This PR bumps rubato to v2.0.0, updates core dependencies to audioadapter/audioadapter-buffers 3.x, and adjusts tests accordingly while also expanding async resampler test coverage.

Changes:

• Bump crate version to 2.0.0, raise MSRV to Rust 1.85, and update dependency versions (notably audioadapter and audioadapter-buffers to 3.0).
• Simplify random test data generation by switching from thread_rng()/Rng to rand::random() in multiple test modules.
• Add new async tests validating that set_resample_ratio_relative() affects produced/consumed frame ratios as expected.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/synchro.rs	Removes unused rand::Rng import in tests.
src/sinc_interpolator/sinc_interpolator_sse.rs	Updates tests to use rand::random() instead of thread_rng() + Rng.
src/sinc_interpolator/sinc_interpolator_neon.rs	Updates tests to use rand::random() instead of thread_rng() + Rng.
src/sinc_interpolator/sinc_interpolator_avx.rs	Updates tests to use rand::random() instead of thread_rng() + Rng.
src/sinc_interpolator/mod.rs	Updates scalar interpolator tests to use rand::random() and removes Rng import.
src/lib.rs	Re-exports audioadapter_buffers and updates test input generation to rand::random().
src/asynchro.rs	Removes rand::Rng import and adds new tests/helpers for relative ratio frame-count behavior.
README.md	Updates MSRV statement and adds v2.0.0 changelog entry.
Cargo.toml	Bumps crate version/MSRV and updates dependency versions (including dev-deps).

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