fix(webhook): Correctly enable serialize feature on all enabled crates #1184

Job	Run time
Docs	1m 10s
format	14s
Check Examples	1m 25s
clippy (default-tls)	1m 34s
clippy (rustls-tls-webpki-roots)	1m 38s
Stripe Mock Tests (default-tls)	1m 52s
verify-codegen-crate	2m 2s
clippy (rustls-tls-native)	1m 37s
Stripe Mock Tests (rustls-tls-webpki-roots)	1m 58s
Test Clients (default-tls)	2m 13s
clippy (async-std-surf)	1m 46s
Stripe Mock Tests (rustls-tls-native)	1m 57s
Test Clients (rustls-tls-webpki-roots)	2m 15s
Test Clients (rustls-tls-native)	2m 16s
Test Clients (async-std-surf)	2m 29s
	26m 26s

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