fix(linux-aec): try main branch of webrtc-audio-processing

v2.0.3 bundled build hits 'Directory does not contain a valid build
tree' because the crate's build.rs uses `meson setup --reconfigure`
unconditionally, which fails on first run when the build dir doesn't
yet contain prior meson state. Try the main branch in case it's been
fixed post-release.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/wzp-client/Cargo.toml

@@ -60,7 +60,7 @@ windows = { version = "0.58", optional = true, features = [
 # so the git path gives us a complete source tree that bundled-mode can
 # build. Pinned to tag v2.0.3 for reproducibility.
 [target.'cfg(target_os = "linux")'.dependencies]
-webrtc-audio-processing = { git = "https://github.com/tonarino/webrtc-audio-processing", tag = "v2.0.3", optional = true, features = ["bundled"] }
+webrtc-audio-processing = { git = "https://github.com/tonarino/webrtc-audio-processing", branch = "main", optional = true, features = ["bundled"] }
 
 [features]
 default = []