build(deps): bump codecov/codecov-action from 5.1.1 to 5.1.2 (#816) #1470

Job	Run time
build with default features	28s
Clippy	36s
build with no_std (ristretto255)	25s
build with no_std (ed25519)	27s
Check Rust doc	31s
Check if automatically generated code is up to date	32s
build with no_std (p256)	27s
Rustfmt	28s
build with no_std (secp256k1)	28s
test on beta	2m 20s
build with no_std (secp256k1-tr)	27s
build with no_std (rerandomized)	25s
actionlint	6s
build with MSRV (1.66.1)	2m 17s
	9m 57s

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