v0.9.3: accept-loop backoff on EMFILE + louder rlimit diagnostics (is… #31

Job	Run time
build (x86_64-apple-darwin, macos-latest, mhrv-rs-macos-amd64)	4m 13s
build (aarch64-unknown-linux-musl, ubuntu-latest, mhrv-rs-linux-musl-arm64)	1m 59s
build (aarch64-apple-darwin, macos-latest, mhrv-rs-macos-arm64)	3m 49s
build (x86_64-unknown-linux-musl, ubuntu-latest, mhrv-rs-linux-musl-amd64)	1m 55s
build (x86_64-unknown-linux-gnu, ubuntu-22.04, mhrv-rs-linux-amd64)	4m 20s
build (aarch64-unknown-linux-gnu, ubuntu-22.04, mhrv-rs-linux-arm64)	1m 47s
build (x86_64-pc-windows-gnu, windows-latest, mhrv-rs-windows-amd64)	7m 41s
build (arm-unknown-linux-gnueabihf, ubuntu-22.04, mhrv-rs-raspbian-armhf)	2m 0s
release	17s
	28m 1s

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