fix: process parallel events and potential deadlock in `on_record` #113

Job	Run time
cargo check	34s
cargo check (feature combinations)	13s
cargo fmt	7s
cargo check (+MSRV -Zminimal-versions) (1.65.0)	3m 24s
cargo test (stable on ubuntu-latest)	1m 1s
cargo check (+MSRV -Zminimal-versions) (stable)	26s
build tests (wasm)	58s
cargo test (beta on ubuntu-latest)	1m 6s
warnings	35s
cargo test (nightly on ubuntu-latest)	1m 5s
cargo test (stable on windows-latest)	2m 35s
cargo test (stable on macos-latest)	5m 25s
all systems go!	1s
	17m 30s

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