Bump andymckay/cancel-action from 0.3 to 0.4 (#53) #81

Job	Run time
(Windows) Builds (x86_64-pc-windows-msvc)	48s
Check (stable)	16s
(Linux) Builds (aarch64-linux-android)	1m 29s
Check (beta)	16s
Bench Compile (stable)	51s
(Linux) Builds (x86_64-unknown-linux-musl)	1m 30s
Check (1.70.0)	17s
(OS X) Builds (aarch64-apple-ios)	2m 7s
(Linux) Builds (wasm32-unknown-unknown)	56s
(OS X) Builds (x86_64-apple-darwin)	3m 9s
Rustfmt (nightly)	15s
Test Suite (stable)	1m 5s
Test Suite (1.70.0)	1m 12s
	14m 11s

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