test

Bump codecov/codecov-action from 2.0.3 to 4.1.0 #249

Job	Run time
Check it compiles on old Rust (1.31.0)	3m 27s
Verify benchmarks compile	22s
32bit tests	18s
Run the big ignored tests	38s
Clippy lints	13s
Check documentation links	11s
Check formatting	7s
Miri checks	5m 49s
Check it compiles on old Rust (1.45.0)	11s
Build & test (ubuntu-latest, stable)	12s
Thread Sanitizer checks MacOS	5m 55s
Build & test (ubuntu-latest, beta)	20s
Build & test (ubuntu-latest, nightly)	48s
Build & test (macos-latest, stable)	30s
Build & test (macos-latest, beta)	57s
Build & test (macos-latest, nightly)	1m 12s
Build & test (windows-latest, stable)	1m 24s
Build & test (windows-latest, beta)	59s
Build & test (windows-latest, nightly)	1m 54s
	25m 27s

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