chore(ci): update to cargo-check-external-types 0.4.0 #3150

Job	Run time
semver	23s
Verify hyper.h is up to date	21s
Check Style	7s
Test with Miri	2m 19s
features	38s
Check MSRV	1m 36s
Test cargo-c support (FFI)	21s
udeps	25s
minimal-versions	52s
Test C API (FFI)	36s
Test beta on ubuntu-latest	1m 7s
Test stable on windows-latest	2m 56s
Test nightly on ubuntu-latest	1m 10s
Test stable on macOS-latest	1m 15s
Test beta on macOS-latest	2m 11s
Test nightly on macOS-latest	1m 50s
Test stable on ubuntu-latest	1m 0s
Test nightly on windows-latest	2m 29s
Test beta on windows-latest	2m 20s
Build docs	20s
Check exposed types	1m 10s
CI is green	3s
	25m 29s

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