feat(spring): enable openApiNullable with useJackson3#23331

wing328 merged 2 commits intoOpenAPITools:masterOpenAPITools/openapi-generator:masterfrom

sonallux:fix/23324-openApiNullable-with-useJackson3sonallux/openapi-generator:fix/23324-openApiNullable-with-useJackson3Copy head branch name to clipboard