test

Bump codecov/codecov-action from 2.0.3 to 4.1.0 #248

Job	Run time
32bit tests	21s
Verify benchmarks compile	36s
Check it compiles on old Rust (1.31.0)	3m 27s
Run the big ignored tests	43s
Clippy lints	25s
Check documentation links	13s
Miri checks	5m 59s
Check formatting	12s
Check it compiles on old Rust (1.45.0)	17s
Build & test (ubuntu-latest, stable)	16s
Thread Sanitizer checks MacOS	5m 54s
Build & test (ubuntu-latest, beta)	28s
Build & test (ubuntu-latest, nightly)	45s
Build & test (macos-latest, stable)	31s
Build & test (macos-latest, beta)	39s
Build & test (macos-latest, nightly)	1m 9s
Build & test (windows-latest, stable)	1m 18s
Build & test (windows-latest, beta)	1m 1s
Build & test (windows-latest, nightly)	1m 29s
	25m 43s

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