ci: fix deprecated codecov argument #348

Job	Run time
cargo check (ubuntu-latest)	7s
Code Coverage (ubuntu-latest, unix)	2m 2s
cargo clippy -- -D warnings (ubuntu-latest)	20s
cargo fmt --all -- --check	6s
cargo check (macOS-latest)	12s
Code Coverage (macos-latest, macos)	3m 5s
cargo clippy -- -D warnings (macOS-latest)	11s
cargo check (windows-latest)	1m 15s
Code Coverage (windows-latest, windows)	7m 2s
cargo clippy -- -D warnings (windows-latest)	1m 39s
GNU test suite	32s
cargo test (ubuntu-latest)	47s
cargo test (macOS-latest)	3m 2s
cargo test (windows-latest)	4m 9s
	24m 29s

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