test

Bump codecov/codecov-action from 2.0.3 to 4.3.1 #269

Job	Run time
Check it compiles on old Rust (1.31.0)	1m 54s
Verify benchmarks compile	58s
Run the big ignored tests	1m 14s
32bit tests	36s
Clippy lints	22s
Test with experimental-thread-local	41s
Check documentation links	8s
Miri checks	7m 19s
Check formatting	5s
Check it compiles on old Rust (1.45.0)	11s
Build & test (ubuntu-latest, stable)	47s
Thread Sanitizer checks MacOS	15s
Build & test (ubuntu-latest, beta)	39s
Build & test (ubuntu-latest, nightly)	41s
Build & test (macos-latest, stable)	52s
Build & test (macos-latest, beta)	44s
Build & test (macos-latest, nightly)	55s
Build & test (windows-latest, stable)	2m 1s
Build & test (windows-latest, beta)	2m 7s
Build & test (windows-latest, nightly)	2m 0s
	24m 29s

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