Fix bug in generic schemas on OpenApi derive macro (#1277) #2938

Job	Run time
typos	3s
test (examples)	8m 45s
test (utoipa)	58s
test (utoipa-gen)	2m 20s
test (utoipa-swagger-ui-vendored)	11s
test (utoipa-swagger-ui)	2m 29s
test (utoipa-redoc)	1m 27s
test (utoipa-rapidoc)	1m 11s
test (utoipa-scalar)	1m 10s
test (utoipa-axum)	49s
test (utoipa-config)	32s
test (utoipa-actix-web)	1m 1s
	20m 56s

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