core: prevent creating a zero identifier with deserialization #1437

Job	Run time
actionlint	13s
build with MSRV (1.66.1)	1m 40s
build with default features	30s
Clippy	30s
build with no_std (ristretto255)	20s
Check Rust doc	34s
build with no_std (ed25519)	41s
Rustfmt	15s
build with no_std (p256)	42s
Check if automatically generated code is up to date	17s
build with no_std (secp256k1)	31s
test on beta	2m 29s
build with no_std (secp256k1-tr)	31s
build with no_std (rerandomized)	18s
	9m 31s

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