cpal

bump ringbuf version in examples (#897) #864

Job	Run time
rustfmt-check	10s
clippy-test	58s
cargo-publish	31s
ubuntu-test	35s
asmjs-wasm32-test (wasm32-unknown-emscripten)	56s
linux-check-and-test-armv7	1m 51s
wasm32-bindgen-test (wasm32-unknown-unknown)	22s
wasm32-wasi-test (wasm32-wasi)	14s
windows-test (x86_64)	3m 2s
android-apk-build	1m 23s
windows-test (i686)	3m 34s
android-check	39s
macos-test	56s
ios-build	2m 48s
wasm-beep-build	33s
	18m 32s

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