Update codecov/codecov-action action to v4 #810

Job	Run time
Unit tests (aarch64-unknown-linux-gnu, stable)	1m 35s
Unit tests with default features disabled (windows-latest)	3m 5s
Unit tests with default features disabled (macos-latest)	52s
Enforce Rust code format	12s
Unit tests (aarch64-unknown-linux-gnu, 1.70.0)	1m 45s
Unit tests with default features disabled (ubuntu-latest)	35s
License / vulnerability audit (advisories)	16s
License / vulnerability audit (bans licenses sources)	15s
Clippy	41s
Preflight docs.rs build	36s
Preflight crate publish (ubuntu-latest, stable)	8s
ReadXMP example	49s
Unit tests with minimum versions of direct dependencies (windows-latest)	1m 22s
Unit tests (windows-latest, stable)	1m 38s
Unit tests with minimum versions of direct dependencies (macos-latest)	1m 10s
Check for unused dependencies	42s
Unit tests (windows-latest, 1.70.0)	1m 49s
Ensure (MAJOR) tag is used when making an API breaking change	39s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	43s
Unit tests (macos-latest, stable)	1m 23s
Unit tests (macos-latest, 1.70.0)	1m 4s
Unit tests (macos-13-xlarge, stable)	50s
Unit tests (macos-13-xlarge, 1.70.0)	55s
Unit tests (ubuntu-latest, stable)	51s
Unit tests (ubuntu-latest, 1.70.0)	54s
	24m 49s

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