replaced `serde_yaml` with `serde_yml` #2953

Job	Run time
test (examples)	8m 57s
test (utoipa)	59s
typos	7s
test (utoipa-gen)	4s
test (utoipa-swagger-ui-vendored)	5s
test (utoipa-swagger-ui)	6s
test (utoipa-redoc)	5s
test (utoipa-rapidoc)	6s
test (utoipa-scalar)	5s
test (utoipa-axum)	5s
test (utoipa-config)	5s
test (utoipa-actix-web)	11s
	10m 55s

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